What Really Happened at the Arecibo Telescope?
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2 роки томуOn the morning of December 1st, 2020, one of the most iconic astronomical instruments in the world collapsed. The Arecibo Telescope was not only one of the largest radio telescopes in the world, it was also a fascinating problem in structural engineering. Its loss was felt across the world. This video provides a quick lesson on radio telescopes, a summary of the failure, and some discussion about the engineering lessons learned in the wake of the event. I hope that eventually, they can replace the telescope with an instrument as futuristic and forward-looking as the Arecibo telescope was when first conceived. It was an ambitious and inspiring structure, and we sure will miss it.
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Practical Engineering is a UKposts channel about infrastructure and the human-made world around us. It is hosted, written, and produced by Grady Hillhouse. We have new videos posted regularly, so please subscribe for updates. If you enjoyed the video, hit that ‘like’ button, give us a comment, or watch another of our videos!
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@PracticalEngineeringChannel 2 роки тому
🚧 When was the first time you heard of Arecibo? 👷 Check out my coverage of other engineering events: ukposts.info/slow/PLTZM4MrZKfW_kLNg2HZxzCBEF-2AuR_vP
@elll300 2 роки тому
i first saw it from James bond as a kid, I always liked the idea of going to see it but what a shame.
@danacoleman4007 2 роки тому
probably on an X-Files episode
@gus473 2 роки тому
We learned about it from "The Weekly Reader" newsletter we got in elementary school! (So maybe the same year President Kennedy was assassinated?) Favorite view of El Radar 📡 (and New Mexico's Very Large Array) is in the movie "Contact!" ✌🏼😎
@Borikwine 2 роки тому
I was born in Puerto Rico and I have been in the observatory many times, every science class from almost every school in PR made field trips year around to the site. It was sad to see the demise of the Arecibo observatory but years of poorly funded maintenance and tropical weather took a toll on a technological and architectural beauty like the Arecibo observatory. Thanks for the video, I am not an engineer but I truly enjoy your videos as they explain in layperson terms a lot of the “magic” of building and construction.
@pj-tt6vi 2 роки тому
X-files season 2 premiere
@shooplah4745 2 роки тому
BF4 Players be like: Ya bud, it’s called levolution and it’s a part of the map.
@robinenbernhard 2 роки тому
Some guy with C4 and poor sniper in top
@mccrystalkai1002 2 роки тому
You made my day, thank you
@la_treta 2 роки тому
Good times
@tollieman5750 2 роки тому
New bf5 looking great so far
@arkangel6281 2 роки тому
I am just amazed how accurately the developers from Bf4 got this right with the levolution.
@chickendrawsdogs3343 2 роки тому
The engineers saw it coming and took safety measures, that's extremely commendable.
@sirfer6969 2 роки тому
Yeah they saw it coming, but nobody did anything about it. Shame on the people that allowed this to happen. F'n losers.
@aemrt5745 2 роки тому
@@sirfer6969 Did you watch the video? They could not repair it without an extreme risk to the crews involved. They did not think there was sufficient margin in the cable system after the initial cable failures and recommended a controlled demolition. The engineers absolutely made the right call. And these are not the people who caused the lack of funds that caused the issue. That was determined by administrative politics. Given what happened, if the construction work began it would have likely pushed the structure to failure with potentially fatal results. Armchair engineers would then say they should have anticipated the collapse and it was too dangerous to repair.
@_Wai_Wai_ 2 роки тому
they saw it coming probably because they knew NASA/NSF budget has been cut.
@_Wai_Wai_ 2 роки тому
@@aemrt5745 Well, if they didn't let the telescope deteriorate to this state, it might not have been too dangerous to repair. When you have USA spending $750 Billion a year for military expansion, and neglecting roads, and science research, this is what happens. Oh BTW, the James Webb telescope launch has been delayed to til December. Once it launches can they guarantee it will be without flaws? I remember the Hubble Telescope that was launched decades ago, they then found a major flaw in the main mirror and had to spend $$'s to fix the flaw. typical of American Aerospace.....
@aemrt5745 2 роки тому
@@_Wai_Wai_ LOL. Typical American Aerospace invented the airplane, created commercial air travel, supersonic flight, devloped rocketry, landed men on the moon, sent probes to all the planets, created satellite communication, GPS, weather satellites, materials technology, faster computers, digital imaging, etc etc. So yeah, I am VERY proud of our Aerospace industry and very proud to have worked in it. Your standard of living would be lower without it. And pushing the frontier carries risk, as any engineering endeavor does. I am proud and happy to be in a nation that is bold and takes risk.
@lunawenko9324 6 місяців тому
I first saw this telescope in Goldeneye, thinking it was just a made-up set to have some cool base for the villain. When I learned that it actually is a real place, I was instantly fascinated and interested in the structure
@captricharddee3634 3 місяці тому
For England James. Buy me a pint.
@mavez6322 3 місяці тому
@@captricharddee3634 No.... for me.
@michaelrmurphy2734 3 місяці тому
Guinness or Kilkenny?
@lunawenko9324 3 місяці тому
@@michaelrmurphy2734 Guinness
@The_BIG_salad 2 місяці тому
@@michaelrmurphy2734 Blatz
@marli01 2 роки тому
Puerto Rican here. I did multiple field trips to the "Radio telescopio de Arecibo" as we called it. One with my school and one with my family just for fun. It was norml to go admire it since it meant so much to us. Even today, if you mention it to a Puerto Rican from the island we think of it with sadness. When it fell it was all anyone could think about. We really did lose an icon.
@bronks76 Рік тому
What is going on now with it,will it be rebuilt?
@marli01 Рік тому
@@bronks76 So far there had been discussions about rebuilding but no actual plans are set. Only budget has been discussed to remove the debris. The station is still being used to study space but they don't have their main instrument.
@bronks76 Рік тому
@@marli01 What I have seen the damages are not too big,in that case shouldn't be difficult to repair,only good will.
@a.c.4054 Рік тому
@@bronks76 rebuild for what? It was obsolete and there are plenty of instruments that do a much better job than it did.
@matthewhayes6806 11 місяців тому
As a gringo mid western man myself I'll tell you that it hurt me as well. My girlfriend is native Puerto Rican and moved and i went to Carolina San Juan. I spent time with the family and then on our vacation west to the farthest of PR. I wish we visited. Holds a lot to me at least. At least a youngling. It's a beautiful place.
@SomeoneCommenting 2 роки тому
You have to admit that this was one of the luckiest drone inspections in history. They were right there, at the right moment, pointing the cameras in the precise point of failure. This is precious footage for investigations and to show how this kind of failure happens in real life.
@HyperMario64 2 роки тому
While this is fortunate, they heard the cables breaking which is why they were remotely inspecting the terminations at the first place.
@DevinEMILE 2 роки тому
That last cable really tried hard to hold it. Second one went as soon as it got more weight, that last one had some fight in it
@halseytaylor9522 2 роки тому
Absolutely. This footage may become as common in university engineering programs as the film of the Tacoma Narrows bridge.
@M1911jln 2 роки тому
The cables were making loud noises as they failed, which prompted the staff to launch the drone. So it wasn't just luck.
@catc8927 2 роки тому
@@badpaw Wow, go take your conspiracy theories elsewhere.
@silverhammer8464 2 роки тому
It's really crazy how accurate the DICE team was at recreating it and even the damage after the receiver fell in game
@ClassicalGamerYT. 2 роки тому
2 days late goddamn as soon as i saw this vid i thought bf4 rogue trabsmission
@gamingpero11 2 роки тому
Bro BF4 was made in 2014
@silverhammer8464 2 роки тому
@@gamingpero11 that's my point, almost like dice predicted it
@gamingpero11 2 роки тому
@@silverhammer8464 ye
@jackleadbetter2987 2 роки тому
thats the first thing i thought of when i seen this lmao
@auntiejen5376 Рік тому
I remember seeing news of the collapse. At the time, I thought it had just been allowed to deteriorate because it was obsolete. I'm both gratified and sad to know that was not the case.
@jovetj 3 місяці тому
Yeah, I thought I generally knew the whole story of its collapse, too.
@effortlessproductions 8 місяців тому
I respect that they decided to keep the crews’ safety in mind as the top priority, that’s very commendable
@russell-di8js 2 місяці тому
That report they made probably saved lives & definitely saved $$$s, & probably under all sorts of pressure themselves. A great piece of independent engineering work & well appreciated i hope!!
@calvinjudy5994 2 роки тому
The engineers who established the safe zones, and recommended the structure be demolished so that they wouldn't risk lives on futile attempts to save it, should be honored. They very likely saved numerous lives with their assessment and education.
@AyCe 2 роки тому
You only get recognition if you act after a catastrophe, preventative measures are usually ignored. People don't value what they can't immediately see.
@ZNotFound 2 роки тому
@@BS-cz6tw Your name is accurate.
@Llortnerof 2 роки тому
@@BS-cz6tw Failed at what? They got it exactly right. There was no practical way of retaining the structure. Preventing people from getting injured was the best anybody could have done at that point.
@antiseth3964 2 роки тому
Yeah sometimes as engineers and scientists you just have to know when to quit. It’s clear that someone not only said it, but that they acted on it and created the safe zones while supervising close observation of the structure. Catching that failure of the cables close up on a drone is insanely lucky.
@jeffstanley4593 2 роки тому
Not only that but they recommended destruction instead of bilking millions of dollars for an impossible repair. This is very rare these days.
@GammaCatch 2 роки тому
-"For England, James?" -"No, for Me."
@Pronoodleeater126 2 роки тому
Based comment
@deathdealer312 2 роки тому
Best comment
@gamingcouplelife559 2 роки тому
Lol, yeah, that's the first thing I thought of too 🤣
@SnabbKassa 2 роки тому
You nicked my joke lol
@iamjakeystyley 2 роки тому
I had to scroll way too long for this comment 😎🤌
@graemeroberts2935 Рік тому
Your commentary is so precise and scrupulously honest, Grady. Your values are in themselves a great inspiration and example to up and coming engineers. Thank you!
@j.w.grayson6937 8 місяців тому
In early 2000's I was involved in the SETI project, thus I was well aware of Arecibo. When we visited PR for a cruise arond 2015, we went in a few days early and took a tour of the facility. It was very impressive!
@crispay8304 2 роки тому
“What really happened?” Simple, a Recon player over the course of 10 minutes placed and demolished each of the supporting wires using his C4
@jaekamacho1416 2 роки тому
"i understood that reference!" 👌🏼😁
@aaronkough3810 2 роки тому
Glad i wasnt the only one who thought of BF4 here
@guineapig1133 2 роки тому
Yep
@tickytock2853 2 роки тому
I thought this was literally a battlefield real life documentary when I clicked on it
@stickiedmin6508 2 роки тому
"C what?" Are you talking about Jeep Stuff?
@malvoliosf 2 роки тому
From Grady’s description of the situation, the question in my mind is not “why did it fall?” but “how on Earth did it stay up as long as it did?” Low safety margins, unique design, constant exposure to salt air and tropical sun, frequent hurricanes, and in at least one case, shoddy workmanship. It seems that receiver was staying up there mostly from force of habit.
@NAUT758 2 роки тому
😂its almost like curiosity rover. Its kept getting saved by random events working years after it was expected. Edit: opportunity rover
@ADAMJWAITE 2 роки тому
As I understand it from watching other videos on the subject, one thing Grady didn't touch on was that adding the additional scientific instruments to the suspended structure added significant weight and stresses to the original infrastructure that over time, may have contributed to the collapse.
@malvoliosf 2 роки тому
@@ADAMJWAITE reminds me of the Asimov story “Shah Guido G.”
@ps.2 2 роки тому
@@ADAMJWAITE Yeah he did, 5:35
@NAUT758 2 роки тому
@@ADAMJWAITE he did talk about it
@kermitefrog64 Рік тому
I have been to Arecibo twice. There were a number of objects including comets that were studied. It was very impressive.
@yonason6047 Рік тому
I was surprised and disappointed when it happened, but was unable to find info on why it had or if there were plans to rebuild. You’ve not only supplied that, but provided backstory as well. Interesting how satisfying a thorough analysis of an event like this can be. Even more satisfying to hear that lives were not wasted by taking unacceptable risks. Very nicely done video. Thanks.
@snafubar447 2 роки тому
"These steel cables were installed 70 years ago, they are perfectly safe." As someone who worked in preventative maintenance for a decade, I don't trust anything that hasn't had a major inspection or overhaul after X amount of hours, let alone DECADES.
@vg2b713 2 роки тому
The Brooklyn Bridge and other old cabled bridges are still standing.
@LKN117 2 роки тому
@@vg2b713 The Brooklyn Bridge has had major structural repairs done in the last 5 years or so. Arecibo had not had anything of the sort in a far longer time frame. That's also not taking any of the environmental stresses taken by each structure or their intended uses into account. You are comparing apples to oranges.
@vg2b713 2 роки тому
@@LKN117 Just saying that the dish cables were under-designed.
@johndododoe1411 2 роки тому
@@LKN117 Consider the number of decades between construction and maintenance on the Brooklyn bridge, that's still a lot. But Arecibo replacement should be designed with a significant safety factor and a regime to completely lower the platform for inspection and maintenance more than once per year.
@TigerOscar78 2 роки тому
Every man made structure needs maintenance, period!
@dvoicer6785 2 роки тому
Man, props to the engineers who got those excellent shots of the telescope failing. I mean, it's sad and all, but at least the shots are really cool, because we get to see it failing it really great detail.
@LillaVya 2 роки тому
I'm sure that footage will help them to know what happened!
@paulmichaelfreedman8334 2 роки тому
The drone footage was a stroke of luck really, as they were evaluating the remaining cables.
@aerodynamicist4 2 роки тому
I suspect the air turbulence from the presence of the drone was the final straw for those cables
@owenkegg5608 2 роки тому
@@aerodynamicist4 This is satire, right? (Sorry, hard to tell)
@GradeEhCanadian 2 роки тому
@@owenkegg5608 wow alot of slow people here today
@LuisMorales-bp3sx 2 роки тому
My dad lived right in Arecibo... In a barrio called Esperanza. It was literally right by the coffee shop thats like 2 miles from the entrance of the observatory.. Had amazing times. Thanks for the great memories and thanks for this awesome video @practicalengineering. 💪🏾🇵🇷
@TheCtrumbo Рік тому
I’ve been fascinated with the structure since Golden Eye. Sad to see go, awesome it was captured on film at the moment of failure.
@mattmullett9521 2 роки тому
Well if I learned one thing, its that cable dehumidification systems exist.
@nateb4630 2 роки тому
They're common in communications cables, both twisted-pair (outdoor telephone lines) and coax (radio broadcast towers). A dry-nitrogen supply, or an air-compressor-dehumidifier, will be regulated to a low pressure that's routed into the cable's interstitial space, to ensure that any cracks in the jacket result in air leaking out, rather than water leaking in. The cable pressurization gas almost always goes through a flow meter on the way, and flow readings are regularly taken as part of maintenance, to assess jacket condition.
@danielmcnulty8736 2 роки тому
@@nateb4630 I had absolutely no idea. Every time I learn something like this, I come to the conclusion that there was more to know that I’m capable of knowing. And that there is more out there than I had any idea how complicated the world is. So damn cool.
@jmr-marc 2 роки тому
humidity in the forest is present continiously
@Danoliveira3 2 роки тому
Tom scott has a great video on it
@Tracomaster 2 роки тому
Tom Scott has a video on that called "how to stop a colossal bridge from corroding"
@SeekerKnight 2 роки тому
As a child of the 50s, this facility was a scientific icon. A source of national pride. It was every bit as important as the space race in those respects. Such a shame to see it meet such a tragic end.
@Oliviaheckel 2 роки тому
It even went beyond national pride for some. As a Mexican kid, I remembered feeling pride in humanity learning about it. Space science has been among the best ambassadors and goodwill creators for US interests around the world since the 50s.
@jesusjesus534 2 роки тому
Well as a Puerto Rican. This facility filled me with pride. That my country Puerto Rico was home to this telescope.
@SeekerKnight 2 роки тому
@@jesusjesus534 It was definitely a super installation at the time!
@zzztriplezzz5264 2 роки тому
@@jesusjesus534 fellow Puerto Rican I know you are proud, but don’t call Puerto Rico a country. It isn’t!
@yanne-pierre4624 2 роки тому
@@zzztriplezzz5264 and what is it
@jamescox7007 Рік тому
Once again you explain difficult engineering concepts so the many armchair engineers can understand what actually happaned. My hats off to you my friend. I have tried to explain some of my work to my wife but fail because of technical jargon. You have a unique gift and should become a collage / university professor.
@Hummingbirdaerial Рік тому
After a previous visit to the island, we finally had the opportunity to visit the observatory in February 2020. It was amazing and I was able to get drone footage of the structure. That might have been some of the last footage obtained before its collapse. Little did I know at the time that that would be the last time I would see it. Very glad I did.
@RyanRiopel 2 роки тому
In the late 2000s I was running SETI@Home, processing data from this telescope. I thought it was the coolest thing as a kid. Sad that this happened. Edit: I found in my e-mails that I joined 15 October 2006!
@mrxmry3264 2 роки тому
yeah, i crunched numbers for SETI too. first it was a standalone project, then it switched over to BOINC. i stopped crunching numbers when i hit a million points.
@NathanielHatley 2 роки тому
Me too.
@1contrarian 2 роки тому
Same here. I eventually moved to Folding@Home.
@mrxmry3264 2 роки тому
@@1contrarian i did some folding too, but when they found the covid vaccines, i stopped that too.
@lnteIIigence 2 роки тому
I was experimenting with different condiments to mix with tuna instead of mayo. Ketchup is a maybe.
@Alex-Lay 2 роки тому
I wish that closer to the collapse someone had mentioned that the towers were named for their position on a clock. I'd never heard the naming until now, so it always seemed odd to hear 'tower 4'
@owensmith7530 2 роки тому
Yes, I remember thinking at the time "hang on a minute, there are only 3, what do you mean 'tower 4'?!"
@a735Alexis 2 роки тому
i would of been so frustrated to hear " tower 4 failed" while being certain there were only 3. real gaslighting lmao
@ErickC 2 роки тому
@@a735Alexis : THERE - ARE - THREE - TOWERS!
@owensmith7530 2 роки тому
@@a735Alexis The three towers are numbered 4, 8 and 12 for their positions on a clock face.
@a735Alexis 2 роки тому
@@owensmith7530 you are dense
@frederickhalgedahl8725 Місяць тому
Hi Grady. Thanks so much for this clear and concise run down on the engineering behind Arecibo. I'm in my 70s and ever since I was a boy I've been inspired by this structure. I was saddened by its demise and in a very real way devastated by its collapse. Your clear-eyed appreciation for the facility and its important work over the years is greatly appreciated. I've driven by the VLA, and even that fleeting glimpse was impressive. And, of course, there are larger radio telescopes, such as the ALMA on the high plain of the Atacama Desert in Chile. But-China's larger facility aside-Arecibo's unique size and natural setting will always serve as an important statement about humankind's irrepressible curiosity. My thanks again for making this video. FH
@csApollo11 Рік тому
Ever since I watched the movie Contact when I was in middle school back in 2002, I wanted to visit here. 20 years later, now it's gone. I had 20 years, but I wasted. Sadness, would be an understatement. Now, I must go see the VLA.
@unformedeight 2 роки тому
Goldeneye people are very aware of this place "For england james?" "No, for me"
@thewrathofforce1147 2 роки тому
Lol
@L_e_o 2 роки тому
That's how I came to this video, wanting to visit the place from goldeneye. Unfortunately won't be possible now
@Redstagwsmnp 2 роки тому
Bond, James Bond
@Darkoriax17 2 роки тому
I was just about to ask “isn’t this the antenna cradle from Goldeneye? …that scene was about the most brutal I ever saw 007. Alec had screwed him over one too many times and he was like “screw the mission, I just want you dead.” Hence the line you mentioned. Alec was trying to taunt him and be like “finishing the mission like a good little lapdog?” “No, I just want you dead” The way his face went from a taunting smirk to a look of terror further illustrates that this was a very rare side of Bond, one who takes a personal vendetta over the mission. He realized his folly too late, and thus Janus was finished.
@megabolt5898 2 роки тому
I was hoping I'd find at least 1 Goldeneye comment here~
@Syamzaf 2 роки тому
Battlefield players: "Hey ive seen this one, ive seen this one its a classic!"
@greenkoopa 2 роки тому
Yeah it's the last level from Goldeneye 😀
@NerfDaPig 2 роки тому
I thought this instantly, but at least I know where the map came from now
@radtap 2 роки тому
The dish map on bf4 is set in 2020 aswell lmfao
@random71856 2 роки тому
Bit of rogue transmission
@ShroudedWolf51 2 роки тому
@The Monster Under Your Bed "People aren't allowed to enjoy things I don't!"
@Glen.Danielsen Рік тому
Brother Hillhouse, thank you for a thorough, incisive, and fascinating narrative! Worth the time start to finish!
@lezleefeetsgoddess Рік тому
This was a fascinating and fantastic video. Luv your videos and thanks for making them. Such a shame to lose this great telescope.
@mr.wiskers8163 2 роки тому
engineers: I wonder why our structure failed. Battlefield 4 players: ‘sweating profusely'
@TrudeaisaWEFpuppet 2 роки тому
Yea pretty sure it was my bad. Crashed my jet into it
@2handsome2die 2 роки тому
Turns out this jeep stuff works on cables, too.
@MarcGyverIt 2 роки тому
I was thinking the same thing lol
@qxTorii 2 роки тому
_whistling while holding my RPG_
@alicorn3924 2 роки тому
Well on BF2042 there is a launch site that we might be able to blow up.
@LucyKosaki 2 роки тому
That one time where the only available footage wasn't recorded by a toaster : D
@DxBlack 2 роки тому
Flying sky-toaster in HD :(
@Carolina-Mary 2 роки тому
But if alien ships zapped the cables with their anti earth telescope ray guns it would most certainly have been recorded by a toaster.
@noobplayer_23 2 роки тому
2 actually in full HD
@ericv00 2 роки тому
*potato
@davidt1d 2 роки тому
@@ericv00 *toaster
@seanriopel3132 Рік тому
I spent 10 minutes watching the failure happen frame by frame (that's the < and > keys when your paused by the way). It is amazing watching a single strand go, then two more, then BAM. the whole cable. The tower sways from the release of lateral tension then the next cable begins to fail. Absolutely amazing. A tragedy no doubt but still stunning that a drone happened to be in the air at the exact moment of failure.
@theshevanel 2 роки тому
It took long enough, but James Bond finally destroyed the Goldeneye.
@greenyawgmoth 2 роки тому
I AM INVINCIBLE!
@emperorfaiz 2 роки тому
For England, James?
@lamar5429 2 роки тому
😂😂😂😂😂
@Gogettor 2 роки тому
Should rename it to Cradle.
@Kiwiherm 2 роки тому
Finally a comment that encompassed what I though when I saw this video
@mimiwey9014 2 роки тому
As a Puerto Rican, I went to the Arecibo Telescope on a High School trip, it broke my heart when it collapsed :(
@hectormelendez7196 2 роки тому
Well, I've visited many times and every single one of them was getting worse. It was a matter of time and human hand to bring it down.
@colspiracy8326 2 роки тому
Aw that's so sad. What was the name of your high school? 😉
@royeb63 2 роки тому
As a non-Puerto Rican I never got the chance to visit it, but it still broke my heart when it collapsed. I hope they build a new and better one at the site.
@vettemuziekjes 2 роки тому
and what did you learn on this schooltrip ?
@colspiracy8326 2 роки тому
@@vettemuziekjes she learnt that it was in the film 'Contact'.
@c-bass9968 2 роки тому
We in Puerto Rico knew it was scheduled to be closed and possibly demolished so we were working on pushing through a rescue plan just before the earthquake hit that is speculated to have caused the wires to fail. Ever since 2020, Puerto Rico has been experiencing violent earthquakes which, although mostly confined to the south, did occur on multiple occasions in our north coast precisely above the municipality of Arecibo. I remember when the news came out that day, there were reports of an earthquake in the north. I just hope that for the sake of my island we can rebuild/reuse that space for scientific research.
@phitzwellthundercock3894 Рік тому
I was fortunate enough to have visited this incredible telescope. It’s really hard to comprehend just how massive it really was by watching vids on it. It was one of those moments when you see it from the observatory platform that amazes what humanity can build, breathtaking. Such a shame they let go out like this. 😢
@markchisholm2657 2 роки тому
In the offshore construction industry we test every year all wire ropes and discard every five years regardless of cost. Factor of safety is between 4 and 8x depending on use. It would be inconceivable to have wire ropes in use this long.
@ctdieselnut 2 роки тому
This video is proof of why that's a good idea. What else is still being used in your life from 1963?
@pinpetos 2 роки тому
@@ctdieselnut I have a toaster from around that era. Oh wait, the power cable has been replaced 😄
@markchisholm2657 2 роки тому
@@ctdieselnut Thing is that it's known that all wire ropes fail. The speed of failure is dependent upon use but it's an absolute cast iron guarantee that at some point they fail and if they are not pressure greased and move then the lifespan is short.
@Pyxis10 2 роки тому
@@ctdieselnut I have a few utensils from before that era. Then again, they're utensils. Kind of hard to break those.
@Jehty21 2 роки тому
Now I wonder how often the ropes on bridges get replaced, if at all.
@Piracanto 2 роки тому
Having lived in Puerto Rico, and having been to this observatory several times with my infant daughter when I was there, I really felt sad when I leaned this happened. Truly a sad tragedy.
@toordog1753 2 роки тому
Nothing happened, it was done intentionally. I dont understand where this guy gets his information, my office literally set up screens and watched the count down to cable burn...
@Piracanto 2 роки тому
@@toordog1753 He says he got the information from the forensic report.... Where could we find reliable information?
@owensmith7530 2 роки тому
@@toordog1753 There was no cable burn, they were still trying to work out how to safely demolish it when it collapsed by itself.
@borghorsa1902 2 роки тому
Puerto Rico should invest into their own science and don't rely on other countries. That's the only way a proud culture can be born
@owensmith7530 2 роки тому
@@borghorsa1902 Puerta Rico is too small to fund something world beating like Arecibo. It's like suggesting the UK fund it's own manned lunar landing, it's way beyond what can be afforded.
@michaelmello42 4 місяці тому
What an outstanding video with loads of engineering detail! I plan to show portions of it in my Statics & Mechanics of Materials course, for example, the discussion of the catenary equation starting at 8:50.
@brianpesci Рік тому
Very informative, seeing the graphs that showed the kips of load/stress brought back bad memories of my statics and strength of materials class.
@miguelsoto1840 2 роки тому
I'm from Puerto Rico and have lived here since l was born, l went on a school trip to the radio telescope and it was the most amazing experience ever, thank you for making this video in honor of this masterpiece of engineering. It was very sad and depressive when it collapsed🥺💔.
@John-jc3ty 2 роки тому
you broke it omg
@robsonwilianwinchester9726 2 роки тому
My condolences to continental American's and Americans from Isla of Puerto Rico.
@fallendown8828 2 роки тому
RIP big mirror thing
@jamesnewcomer4939 2 роки тому
The saddest part is that the U.S. is no longer the kind of country to REBUILD such a valuable asset!
@Allan_aka_RocKITEman 2 роки тому
@Miguel Soto >>> FWIW: I used to be in the US Coast Guard. I deployed to USCG Air Station Borinquen a few times, and actually flew over the dish a couple of times while there. I -- and others with me -- wanted to visit Arecibo, but we never had enough spare time to do it. I retired from the USCG in 2003, but I STILL would have loved to return to P.R. to visit the site. Too late now...😞
@WyvernApalis 2 роки тому
Engineers: you'll need to demolish it Arceibo: YOU'LL NEVER TAKE ME ALIVE!
@mememan7515 2 роки тому
XD
@buzzynut 2 роки тому
"Hold my beer..."
@pedrofellipe8028 2 роки тому
You can't fire me, I quit!
@abe_linc02 2 роки тому
Onjijio m.oo n
@desertsolopsism 2 роки тому
😂😂
@cartersmith6628 Рік тому
Even though the loss of the structure was great it’s good to hear that the safety concerns of the people that would be working on it took priority
@jimbaker4931 2 роки тому
Great engineering based presentation. I’m looking forward to more practical Engineering!
@xDeadMedic 2 роки тому
13:00 He mentions how the chipped paint indicates strand failure, and a great display of that is at 13:17 when the nearest cable absolutely shreds all of its paint in a matter of seconds as the cable unravels.
@johnsmith1474 2 роки тому
Which itself is a sign of other underlying problems namely improper maintenance. As you have seen for instance on a car, the paint on properly prepped metal does not flake off in for instance an accident. A proper paint coating for this safety application would be paint that bonds completely to the substrate, ie a bonding rust preventative metal primer that could not possibly "flake off" with a proper waterproof top coat. This flaking material looks like water based latex paint which of course encourages rust. Typical PR low quality work and bad inspection processes.
@HermanHiebert 2 роки тому
Sounds like a success story. They saw it coming, and nobody got hurt.
@JainZar1 2 роки тому
This. It is a stark contrast to the overblown media coverage we got when the telescope collapsed.
@daebak7370 2 роки тому
We are fighting against purveyors of massive lies misinformation and manipulation of the highest order. Freemasons control every sector of society. New world order led by obama and pope francis is coming. Jesus christ is coming back for the rapture. Get ready. Dont believe the coming ufo alien abduction narrative
@JainZar1 2 роки тому
@@daebak7370 Also Ferrero is a front company for the Grey Ones, why else would they produce "Tic Tac's", way before humanity became aware of the UAPs?
@uzijn 2 роки тому
@@daebak7370 What's the UFO alien abduction narrative?
@inparis5724 2 роки тому
@@daebak7370 go nuts brother, I work for the CIA and im watching you right now. Wave!
@michaelhirschbuhl1823 Рік тому
These videos are always so well researched and presented!!!
@henrywit6147 Рік тому
Awesome video. Extremely informative. I do hope plans are made to rebuild at some point, with modern technologies obviously.
@michaelhawthorne8696 2 роки тому
That drone couldn't have been in a better place. This footage reveals so much of a catastrophic event you could ever want.....The support towers move so much too.
@Musikur 2 роки тому
It's actually a shame that they turn in around, we miss the gantry falling, and because of the turn also miss the tower collapsing
@dandanthedandan7558 2 роки тому
@@Musikur I'd want to see the center of the telescope more than the tower falling
@Valgrind850 2 роки тому
Can’t believe the news barely covered this, if at all
@MylesMartinez 2 роки тому
Well, the coof and the election were kinda taking up America's collective attention bandwidth.
@matthewmillar3804 2 роки тому
No kidding. I had no idea it collapsed.
@bapt_andthebasses 2 роки тому
Dude there's a high killing virus going on!!!
@QuantumRads 2 роки тому
@@bapt_andthebasses Lol you watch too much of the news. It has like a 98% recovery rate.
@bapt_andthebasses 2 роки тому
@@QuantumRads i was being ironic 😂
@kjamison5951 10 місяців тому
Thanks, Grady! It would be fitting to rebuild this facility to modern standards with a different type of detector but I have read the site will be redesigned to be a leading edge STEM facility.
@brahm-ahamasmi Рік тому
Brady is a magician. He can write epics on scientific topics. His non-hyperbolic genuine jargon keeps his storytelling interesting. So much to learn from him for all Science teachers
@thecatofnineswords 2 роки тому
Built in the early 1960s, survived until 2020, that's almost 60 years of service. For a structure built without computer modelling, that's a good life. I commend the engineers who built it. I commend the science it brought to us. The learning! and lastly, commendations to the engineers who decreed it to unsafe to repair, for it was. Vale, Arecibo. You did well.
@StonyRC 2 роки тому
The Cat of Nine Swords - VERY well phrased. The structure was an outstanding success.
@Abrdoks 2 роки тому
Union Suspension Bridge (1820) is still functioning, but hey, I salute the heroes who were too scared to get near a telescope to repair it.
@SeveralBirbs 2 роки тому
@@Abrdoks would you rather they risk their life?
@Sasasala386 2 роки тому
@@Abrdoks Dumbest comment of the week. You think this is a movie kid?
@Abrdoks 2 роки тому
@@Sasasala386 Yes, a movie called "A Bug's Life".
@raemckay 2 роки тому
Images of Arecibo Observatory were included on the Voyager probe “Golden Records”. Carl Sagan mused that the records would long outlive us and our civilization, and seeing the structure crumble really brought that home for me.
@austinevplab7167 Рік тому
I alway knew *of it* but now I know *_about it_* What incredible videos of the collapse! Thank you for a great job.
@MartinAston00 3 місяці тому
LOVE THIS CHANNEL ! ..most I know find it weird, but I absolutely love these deep dives👍
@christheother9088 2 роки тому
A guy tried to get me to climb a 30 foot light duty ladder ( I was heavier than the recommended maximum weight ) - he cited the "safety factor" should allow me to safely use it. I refused.
@soaringvulture 2 роки тому
I wouldn't climb a 30-foot ladder under any conditions, safety factor or not.
@christheother9088 2 роки тому
@@soaringvulture I ended up buying a heavy duty one that weighed alot - but once you got it set up it was like a staircase.
@brad885 2 роки тому
@@soaringvulture I do it every day. With the proper tie offs it's quite safe.
@Markle2k 2 роки тому
@@brad885 Not with me on it. My legs start shaking about 15 feet up if I'm not on a platform. My fear of heights is more a fear of losing control and falling. Standing on the rim of the Grand Canyon, or an observation floor in a tall building, or even in a light aircraft thousands of feet over the ground, no problem. Also, since I got a concussion after I got hit by a car, I get vertigo easily.
@johnsmith1474 2 роки тому
Sounds like your heart attack risk exceeds your ladder risk.
@jonathanbr7_ 2 роки тому
The video of the collapse was heartbreaking..
@stabileseitenlage 2 роки тому
Just imagine maintaining this Telescope for decades and then when everything is going south, while looking for a way to get it back on track, you are watching it fail in real time through a drone, from just meters away. I bet he felt his stomach drop, as soon as he saw the additional cable snap.
@michaelmccarthy4615 2 роки тому
Its sad, but they all knew it was failing... its life span was approaching
@MikeHarris1984 2 роки тому
It was so hard to watch knowing that there is a TON of data and knowledge (yet to be discovered) crashing down with it for so many years to come.
@calholli 2 роки тому
It was built in the 60's... It was time for it to go.
@ninadsbhatt100 2 роки тому
It was amazing luck, though
@albertschepis Рік тому
Very interesting. I did not know the structure collapsed until seeing this video today. I do like how "Practical Engineering" presents things.
@sonjasleeper1511 Рік тому
Always interesting stuff, helps me learn more about how things work
@monkeyvittles 2 роки тому
In engineering, failures are often just as important as successes. It's reassuring to see that this is being investigated so thoroughly. Hopefully we learn a lot about what happened, and apply that in the future.
@michaelramos2121 2 роки тому
Corruption and bad maintenance is what happened.
@mattlogue1300 2 роки тому
Mike, it was so unexpected I have a feeling it could of been sabotage.
@ianchandley 2 роки тому
We are only as good as our last failure……. No matter how many risks we identify or know about, there will always be something that has never been imagined.
@ivonneriveraalswager4865 Рік тому
And Who will pay...Cornell Uni. or Puerto Rico?
@ivonneriveraalswager4865 Рік тому
@@michaelramos2121 Agreed Bad maintance! nothing last 4 ever.
@needamuffin 2 роки тому
That drone footage is amazing and terrifying. The energy involved in the snap is clear and its destructive potential for anything in its way must've been unheard of. It's fascinating, and I imagine extremely helpful, to have such clear footage of such a catastrophic failure.
@arader17 2 роки тому
I thought it was really interesting how when the cable snaps it sheds all of the paint in an instant.
@rapidrabbit7175 2 роки тому
This is where Rice Crispys got their sound effects.
@stephenhurd1489 2 роки тому
Almost like they needed evidence.... Hmm
@aemrt5745 2 роки тому
Steel cable are extremely dangerous and demand respect. Even small load applications (such as car winches) can be lethal if the cable snaps. Regular inspections are a must and always anticipate where it may move if it fails and stay clear of that area. There is tremendous potential energy under load.
@derchozenvun83 2 роки тому
Divine intervention.
@hasnoname4815 Рік тому
Thank you for covering this; I lived close to the telescope and got to visit before it went down.
@hectorperezphotographer 2 місяці тому
Great video. Had the chance to visit the site a couple of times before its demise.
@dethrophes7283 2 роки тому
Given it was built 70 years ago for an immediate military need and lasted for 70 years... I'd say the margin of safety was fine. If anything the issue was one of up keep and maintenance.
@danfr 2 роки тому
Agreed, the "trying for years to divert funds" was probably the beginning of Arecibo's end. You can't maintain something if the funds you need to maintain it are being scraped away. I don't really blame them for trying to divert funds though. The real blame probably lies in how criminally underfunded scientific organizations are. They're one of the first things to get cuts despite often providing a lot of value for what funds you do put in.
@x--. 2 роки тому
@@danfr I like your point -- it also shows why it's so important for engineers, designers, administrators and whoever else is getting paid to look after our equipment to *be honest* about the state of things. I can't help but feeling that _someone_ knew how little margin there was and should have warned what would happen.
@jackt6595 2 роки тому
Yeah the main cables should have been replaced at some point. Or at least one of them taken off the examine how they were holding up.
@CIubDuck 2 роки тому
This is much like NASAs probes and satellites, they over-engineer them and tell us they won't last for long. They give us a "disappointing" estimated lifetime of like 15 years, but 40 years later they are still perfectly functional and operational. I love that the engineers gives a low lifetime guarantee, just so that they can surprise us later how much longer they actually lasted because of their amazing engineering.
@dekonfrost7 2 роки тому
We have better ways now, of doing what it did.
@smokie3248 2 роки тому
As someone who regularly pours sockets for my job, I really appreciate the attention to details in this video. I want to share this with my crew, this is a great teaching tool to the importance of following procedures every single time. Great work!
@liesdamnlies3372 2 роки тому
Hope you did. Screw-up or get lazy on critical infrastructure and people die.
@JWRay-xh9wl 2 роки тому
Yeah,brother don't I know it,you don't follow procedures that keep you alive,well....
@honda0303031 2 роки тому
You don’t pour nuthin
@smokie3248 2 роки тому
There’s always one! So, what do you do for a living?
@honda0303031 2 роки тому
@@smokie3248 just a joke buddy. I actually do rigging. Been rigging for over 18 years. Poured many spelter sockets building mast raising lines. Biggest we were able to do was 2-1/4”.
@archangel1221 2 місяці тому
The fact that it could emit (work as a radar) was amazing. It was crucial in mapping asteroids and other near earth orbit items.
@brahmburgers 6 місяців тому
very good assessment, thanks for the video and narration.
@andvil01 2 роки тому
Todays words are: redundancy and safety factor. Don't you ever forget them.
@HambertHM 2 роки тому
You cannot rely only on safety factor and redundancy when both of those characteristics can be affected over time due to corrosion and other incidents. They are very dynamic over time, difficult to predict and modelate, and that is the problem here.
@BeingMe23 2 роки тому
@@HambertHM If they rebuild it. They need to use galvanized cable and do yearly inspections.
@mrl22222 2 роки тому
also consider design life. I doubt the military specified a design life of over 50 years, Design life plays heavily into material and assembly decisions all along hte line. Although "maintenance" can extend the life of just about anything, it won't last forever. concrete and steel designed for 50 years may last to 60, but probebly not 70...
@lachlanhudson7404 2 роки тому
@@mrl22222 funny you give that 50 year mark saying that with proper maintenance, keeping it til 60 is quite likely... most of the US's original infrastructure during the highway boom was designed for that 50 year mark and here we are approaching that 70 years xD
@D00000T 2 роки тому
@@HambertHM today’s additional phrase is: responsible maintenance
@JanTuts 2 роки тому
Wait, what? The dish was made of aluminium plates on steel cables, suspended over the valley?! For some reason, I always though it was concrete, built directly on the valley floor!
@sergeysmirnov1062 2 роки тому
Me as well, yeah, was stunned when I found out back then.
@derrickhappytree 2 роки тому
Yeah seriously when Alec Trevelyan landed on it in Goldeneye it was solid
@frollard 2 роки тому
derek has it - definitely Goldeneye screwed up that belief :)
@psansoucy 2 роки тому
The dish was originally a series of suspended cables, far above the ground below - 100 feet or more. The plates were added to the cables years after I was there in 1968.
@RNCHFND 2 роки тому
@@psansoucy Like a net?
@JackClayton123 Рік тому
Always enjoy these videos!
@chrisrussell7758 Рік тому
I was lucky enough to know a man that was an engineer of sorts on this project, he was awesome
@lucasalvarez8524 2 роки тому
The only thing *more* incredible than the ingenuity and scale of the Arecibo Telescope, is that this video didn't once reference Golden Eye. Well done, sir.
@leopineda6198 2 роки тому
Nor Contact!
@zackh5413 2 роки тому
1v1 cradle slappers only
@derrickhappytree 2 роки тому
@@zackh5413 🤚💢 😆
@jesuslovesyou-mattsmith1502 2 роки тому
@@zackh5413 took me a minute but great comment!
@tateranus4365 2 роки тому
Or battlefield.
@typryor2227 2 роки тому
It’s not every day you get to see such a catastrophic failure from such a large structure.
@WellCookedPotatoes 2 роки тому
Laughs in BF4
@starstencahl8985 2 роки тому
@@WellCookedPotatoes In real life
@ilovefunnyamv2nd 2 роки тому
@@WellCookedPotatoes yeah you're laughing, but like starsten said, real life. This is a structure so large its difficult to contemplate, a 3 football fields wide diameter dish. This is nothing like building something with TnT in minecraft
@WooferCooker 2 роки тому
Laughs in Florida condo
@Stripdancer100 2 роки тому
Ty Pryor Look for "Stadium roof collapse kills worker in Russia", it's a tragically epic scene
@googlreviews7813 2 роки тому
Wow, what a shame. I too hope that they will replace the telescope with new one and that the facility will continue to operate. Great video,thank you for sharing, I had no idea this even existed.
@michaelcoursey8614 2 роки тому
Thanks for clarifying this situation.🤔
@straightfaceguy7966 2 роки тому
57 years is a good innings for that telescope, you need to remember when it was "rushed" to track incoming nukes longevity wasnt on the cards.
@Musikur 2 роки тому
Probably the reason for the low structural margins as described
@spugintrntl 2 роки тому
Exactly what I was thinking.
@huntergman8338 2 роки тому
Like any other government project.
@BloodPshyco73 2 роки тому
I find it a little impressive it lasted for 57 years considering
@SonakaG 2 роки тому
"The Jewel of Puerto Rico" Oh how it hurts my heart to see it break. Thank god no one got hurt in the collapse. As a Puerto Rican who grew up on the Island and visited the place during a middle school field trip, I never thought this would ever happen, from up close it just looks so perfectly designed and sturdy, a testament to the Puerto Rican spirit. man... my heart goes out to all the researchers there, may god bless them, and hopefully we can recreate her, but stronger and better equipped for our harsh weather.
@G30RG303 2 роки тому
Puerto Rican here as well. And i basically feel a you do as someone who went there in elementary or middle school.. it is heart breaking to see such a beautiful structure fall. I'm hoping to be alive if they do something with that place.
@glitchy_weasel Рік тому
Arecibo has definitely an icon of Puerto Rico, despite not being so popular in later years. Fantastic video!
@user-tb5mt6bb9b 7 місяців тому
Just discovered the loss. A wonderful friend, also gone, worked on that project. Two sad losses for me.
@JamesChurchill3 2 роки тому
What really happened is James Bond dropped the centre section on Alec Trevelyan
@kylo_ben 2 роки тому
Damn. You got there first
@cefb8923 2 роки тому
Cradle to the grave. Sad way to kill off Ned Stark.
@mickles1975 2 роки тому
Damn it. I was going to say that.
@hwykng82 2 роки тому
For England James?
@carlsberg-gs6rl 2 роки тому
@@hwykng82 For me
@krystal_vector5412 2 роки тому
My mother grew up on the island and we were heartbroken when it collapsed, it was built before she was born so all she’s ever known was that telescope always being there. I was lucky enough to go and see the dish many years ago when we were visiting the island. There isn’t a single picture that fully captures how massive it was. A true marvel of engineering, an invaluable scientific tool, and a cultural icon. You will be missed.
@jasonpowell8832 2 роки тому
Interesting video. I didn't know it had collapsed. My science teacher from 30 years ago was a physicist and worked at this telescope before he retired and became a teacher.
@jgurka2105 Рік тому
Fascinating and very clear - thanks.
@robertc49 2 роки тому
I ran across that telescope so many times in my youth. Golden Eye. N64.
@littlefishbigpond5769 2 роки тому
“For England James”
@lorriecarrel9962 2 роки тому
Good memories,that was a fun time in my life
@spoiledmilk2587 2 роки тому
Bf4
@pabloata4708 2 роки тому
"Just Cause 2" =)
@charliepearce8767 2 роки тому
Robert c, "Ran across it ?" Physically ran ?
@AtotehZ 2 роки тому
15:13 This has saved many structures. A notable one was a skyscraper in New York where they miscalculated the forces high winds would have on it from a specific angle. If I remember correctly it was caught by a student who got in contact with the designer of the building to let him know. If the building had failed, many thousands could've died.
@L1m3r 2 роки тому
Good talk about exactly that "incident" -> "The building built on stilts - Nickolas Means" ukposts.info/have/v-deo/hnyJralwrZ2Iyo0.html The crisis management even played through the domino effect of that building tipping neighboring skyscrapers and so on ...
@austinreeves5221 2 роки тому
yeah i watched that video.
@Aikisbest 2 роки тому
Ive been watching a bunch of vids on air travel accidents lately, and this makes me think of all the accidents that they determined might have been avoided if the less experienced/ranked person in the cockpit actually felt like they could speak up about concerns they might have, or to actually take action when their superior is seemingly doing a mistake. I can only imagine how many times someone like this student have been (and still will be) given a big "FU" in response to bringing up issues like this.
@goochfitness26 Рік тому
@@Aikisbest I been watching them videos too that's how i got here🤣
@wizardgmb Рік тому
The deficiency was not in design calculations but rather a change from welded steel joints to bolted ones that wasn't recalculted. The student was strongly rebuffed by the designer during a phone conversation but just to be thorough the designer went back over his calculations & the "as built" drawings. To his horror he discovered the student was correct; the building was susceptible to corner forces (most rectangular buildings are more susceptible to face forces) from major storms such as hurricanes. After contemplating suicide, he contacted Citigroup executives & devised plans to remedy the problem by having swarms of welders descend upon the building after occupants departed at night & installing a backup electric generator for a balance pendulum. Citicorp was so thankful for his honesty they covered $6M of the $8M retrofit not covered by the designer's insurance. The problem was kept under wraps for 20 years & the student didn't find out what she set in motion until 5 years later.
@luisangeldrosnegron3445 Рік тому
Ty for this informative video I learned alot.
@joelaperez4835 2 роки тому
I was raised in PR and went on multiple field trips to Arecibo.
@deadizbetter 2 роки тому
I've sniped so many players on top of that platform in the middle.
@TorontoMuscle 2 роки тому
😵
@tagg946 2 роки тому
battlefield 4 feels
@BBTHEDOD 2 роки тому
Rogue Transmission is classic
@cameronlegree 2 роки тому
I came here to say the same lmao
@jeremysanchez8329 2 роки тому
Golden eye
@DavidHHermanson 2 роки тому
The techniques of inspection, pioneered for cable stay bridges, clearly were not applied early enough [if at all] to Arecibo. The most telling statement of real responsibility for this disaster: "The NSF had been trying for years to divert Arecibo funds to newer projects."
@loganiushere 2 роки тому
We need more science funding So that we don't have to pick between newer projects and older ones
@DavidHHermanson 2 роки тому
@@loganiushere Yes! We also need to be doing a better job teaching science and math, starting with the primary level.In spite of the latest wave of "MAST" curricula, far too often poorly trained teachers, bad or compromised curricula, and textbooks that emphasise "facts" (usually out of date or censored at the time of publication) instead of methods and the joy of discovery, give us high school graduates who confuse the factual with the capital "t" Truth of religions and politicians. This leaves our children unprepared for the existential threats they will face. Science has given humanity methods to improve food supplies, sanitation and healthcare in ways unimaginable to earlier generations. Its commercial misuse now endangers us all, but the answer is not to wait for mass extinction, but better science, more generously funded and conducted by more people, all in a manner prioritizing the securing of life instead of profits.
@randyralls9658 Рік тому
Amazingly someone was pointing a drone camera at the right place at the perfect time. 😮 just amazing
@archlich4489 10 місяців тому
I saw this place featured on an episode of "3-2-1 Contact" when I was a kid. Sad to see it come to this.
@elnolde754 2 роки тому
The Engineers: "We sadly must recommend to disassemble the Telescope" The Telescope:" I'll do it my way"
@Deeds_of_Love 2 роки тому
You can't kill me if I kill myself!
@cece3194 2 роки тому
@@Deeds_of_Love Guess it showed them. The final picture.
@ballsackfart 2 роки тому
@@cece3194 it left us with the beautiful battlefield 4 map and a huge area for sick skateboard tricks
@lalruatfela3394 2 роки тому
*plays Frank Sinatra's "My Way"
@elnolde754 2 роки тому
@@lalruatfela3394 Yeah that was intended
@omahanprabla3058 2 роки тому
As a Puerto Rican who could see the telescope from my backyard, thank you so much for making this video. I'm pretty sad how this installation went down. The time and passion you put into your videos is incredible, I feel like I'm in class learning something new.
@apinakapina 11 місяців тому
Gosh darn, what a great presentation.
@CapoEL21 Місяць тому
Fascinating... It's a failure of humanity how this was allowed to happen. Thankfully, no one lost their lives. The engineers examining this phenomenon are amazing
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