also would like to complement alan alda for doing his physics homework and einstein homework well enough to have a discussion with brian that bridges the gap between lay and expert.

A particle walked into a bar.... and it didn't

9:58 Brian: "... Jump out a window, and then gravity goes away." Alan Alda: "What? You jump out the window, gravity makes a quick entrance." hardest I've laughed all day.

can we just acknowledge those 2 catches :)

love to see an actor not only good at acting, but has enough knowledge to talk about Einstein with a physicist

This is how science should be, the impossible comment followed by clear as a bell demonstration - terrific

It's always worth bearing in mind that usually, whenever we think that Einstein was wrong about something, it turns out he was right all along.

The world Needs more professors like Brian Green 😌👏👏👏👌👌👌

I love science, it is art, it is imagination, it is specific, intellectual, considered, controversial, creative, psycholically impacted by the researchers and possibly the assessors. It opens up many possibilities and chaos. What a stimulating endless field.

Darn he explained things better than professor michio kaku....damn this explanation was worthwhile..15 minutes well spent

Einstein took the simple observation that light had a fixed speed ...and like pulling a thread on a sweater, unraveled all of these other equations and revelations. But Einstein viewed things as concrete and could never accept the uncertainty of quantum mechanics.

spooky = spukhaft Einstein called it "spukhafte Fernwirkung" = spooky remote/distance-effect"

What a wonderful chat.

I like the reaction "What?!!? you jump out of window, gravity makes a quick entrance!".

11:28 is no one gonna appreciate Brian's catching damn

i could never imagine an old man this cool,..

A photon checks into a hotel when the bellhop asks, "Would you like help with your luggage?" The photon replies, "I don't have any. I always travel light."

great video. I feel like I'm discovering Mr. Alda for the first time even though I've known who he is for about 40 years. what a cool guy to listen to

Every now and then i return to this beautiful conversation

Enjoy listening to that great conversation. Love physics. Brian Greene and Alan Alda are both great communicators for science. Have been following Brian Greene from the 90s greatly enjoying his book The Elegant Universe as well as his other books, appearances on science panels which I watch often on UKposts, CSPAN, PBS specials and whatever else. He is very good at conveying physics and making it clear and understandable. Love listening to him.

Brian is so great at explaining concepts, it's great to listen to him

Great simplified explanation and discussion :)

My new favorite explanation of General Relativity. Thanks, Dr. Greene.

Here are two people I never thought I would see together. So heartwarming

I like Brian Greene because he explains things in a simple manner. My favorite book of his is The Fabric of The Cosmos.

The title should be, "Einstein's Happiest Thought: If a person falls freely, he cannot feel his own weight!" Turn to 9:00 for this thought, a demonstration of it using water, and some comments on the role it plays in Einstein's general theory of relativity. Turn to Kip S. Thorne's book Black Holes and Time Warps: Einstein's Outrageous Legacy chapter 2, for a good telling of the way this happiest thought came to Einstein in 1907 and how it bloomed into a theory of curved space-time eight years later.

I hope to attend one of Brian greens world science festivals one day .Alan alda was or is a very underrated actor. I actually was working on a script at one time with him in mind in the leading role.

Brian Greene, he is the best at explaining (Classic physic,Quantum theory,String theory,.....)Science in general.I think one day he will surprise us with something new, we all need to understand. ( Greene joined the physics faculty of Cornell University in 1990, and was appointed to a full professorship in 1995. The following year, he joined the staff of Columbia University as a full professor. At Columbia, Greene is co-director of the university's Institute for Strings, Cosmology, and Astroparticle Physics (ISCAP), and is leading a research program applying superstring theory to cosmological questions. He is also one of the FQXi large grant awardees, his project title being "Arrow of Time in the Quantum Universe". His co-investigators are David Albert and Maulik Parikh.)....

For those who ask: the video starts at 0:00 and ends at 15:14

BRIAN GREENE IS ONE OF THE BEST. NOT TOO MANY UNDERSTAND QUANTUM MECHANIC LIKE HIM. THANK YOU

Two more intelligent and gracious people I have never seen having a public discussion.

11:35 I love how puzzled Alda looks at the wet floor, for a solid five seconds 😂

You don't see round earth deniers or conspiracy theorist about the earth or universe on these type videos, it's too much information for them to comprehend.

I feel privileged to be here listening to Brian Greene and laughing at his sarcasm like anyone else present there with him in the room... I feel privileged that I am among those curious people who understands such complex things

I love Alan Alda's science shows. He's funny and asks the questions people like myself, who are interested but don't know much, want to get answers for!

Greene explains Einsteins equivalence of gravity field and accelerated frame of reference but should have taken it to next level explaining the affect of light traveling in that gravity field and how it provided the insight that gravity is the consequence of the variations of the geometry of space-time (where mass-energy tells us the geometry).

Alan Alda is brilliant. Great comic timing, and he obviously knows his stuff about physics. Great way to make it interesting and comprehensible.

I loved this conversation and the older gentleman was just a delight haha

Why when the lid is closed tightly on the bottle water does not pour out from the holes at the bottle's bottom?

0:24 sounded like Wii tennis when you get too close to the fence

Einstein said "If you can't explain it simply, you don't understand it well enough", Only a few can explain Quantum physics as Brian did.

Seriously? We have 41 people NOT LINKING this video? What has happened to this world?

I wish they would put the date on these videos.

Relativity describes the relationship between the force and the observer . . . a great deal of this discussion is pretty confounded. Gravity is simply an expression of momentum, albeit on a planetary (or cosmic) scale, and indeed the two forces (gravity and momentum) behave in an almost identical manner. Greene seems to rush through the most pivotal portion of Einsteins discovery. When Einstein envisioned a man trapped inside of an elevator, one that was caught in free-fall down its shaft, the man inside that elevator observes an actual weightlessness as real as any scale could possibly register him in that moment (without the force of gravity acting upon his body at all.) That was actually the apex of his theory, not the man simply jumping out the window. We, observing outside of the falling elevator, know that the force of gravity is working equally upon the man as it is on the environment around him, making the negation of the force of gravity relative to his personal observation. It is the same for an object caught in orbit around a cosmic body: The "weightlessness" an object experiences in space is actually micro-gravity, not "anti-gravity". That micro-gravity is a point of free-fall that holds its own momentum equally in tandem with that of the Earth, skirting just around the very edge of the dent the Earth's mass affects onto space/time. That relativity is the same with the water bottle: Gravity did not go away inside the bottle when it was dropped, but the force of gravity was working equally on the water molecules inside it as it was on the bottle itself. Only the observation was that of "anti-gravity". It does not matter if the observable point - and in that case the water - contains no conscious sensory organs to observe the negated effects (such as proprioception or visual orientation;) There is still a physical point which can be observed. What seems to be missed in this discussion is the objective mass of an observer (or point of observation,) and the most vital ramification of a scale registering an equal amount of applied gravitational force when the elevator is lifted, adding momentum to the already existing force generated by the Earth itself. Quantum Mechanics never negated the empirical reality of General Relativity, and I cannot understand why Einstein couldn't see that - as Greene suggests here. I've only studied Einstein's work, not his personal life. What he actually nailed exactly was the reality of the physical universe, of gross matter, which we also know he described as being composed of energetic constituents (of course though E=MC^2.) It is those energetic constituents that defy observation, which is why pure energy particles must be considered in terms of a wave and their location deduced with uncertainty. But quantum phenomenon, such as entanglement, may very well adhere to a certain type of relativity that simply defies our current understanding of existence, being unobservable (except perhaps in their effects.) And I would bet every dime that I have, or ever will have, against there being found a "graviton" or any quantum particle to equate the force of gravity.

A particle walks into a bar ... through two different doors ... waving.

13:05 Einstein reduced gravity to motion. Now we just have to reduce electromagnetism to motion and we have a theory of everything. Walter Russell has done this already and it is worth investigating.

Loved the analogy of the elvator speeding up in free space. But 8f thats the case , why does earth stops "rushing" towards you when you are above it in space ? By this theory , even if your are in outer space above the earth , the earth shoukd rush towards you ? Right ? Anyone ?

Could it be possible if unlike single particle acting as a wave can't be given a prediction but if multiple particles are taken together as one they could definitely be predicted with certainty. Or as the number of interacting particles increase the certainty increase?

I love listening to Brian Greene, he explains things in such a clear way, even a layman (like me) can understand quantum physics at a high level.

Brilliant watch

Thank you Brian, Thank you Allen, that was beautiful, peace and love, Doug.

Has anyone thought that the way space an time are tied together in GE is similar to the way momentum and position are tied together in QM?

That look 14:00 😂😂😂

change places with heat and motion. Interesting relationships starts to be revealed.

Who else misses Scientific American Frontiers with Alan Alda? Such a fantastic show.

Love Brian Green and Alan Alda is such an intelligent interviewer. Nice video

gravity and motion have the same effect on angular momentum play with that and you will win

alda reminds me of a cross between ralph nader and carl sagen.. 'thats a compliment of major proportions'..

Einstein, my number 1 teach who taught me about everything that exist through general relativity.

The guest of owner is from the TV series called the blacklist

I'm looking for Alan Alda stuff because I love him as an actor, not a scientist. You guys are way too smart for me, I feel belittled xD

Frankly, I think Einstein was right. Once we have a grand unified theory, I think the seemingly randomness of quantum mechanics will be shown its not pure chance & probability & Einstein will be proven right. String theory or/and M theory might be the answer. Higher dimensions might explain entanglement.

Nice, this video finally made me understand how gravity really isn't a force of attraction but, as Einstein proposed it, a warping of space time which creates an accelerating field.

7:00 We Grmans pronounce it quit the same, spooky / spuckig, but we stress "u" like "oo". Thx Brian

Imagine if Einstein embraced Quantum Mechanics i wonder if he would have been able to unify the forces then.

Summary of Einstein's opinion on quantum mechanics: "Gott würfelt nicht." - "God doesn't roll dice."

I've had so-called quantum physicists explain different facets of that science and contradict themselves within three sentences. They were quite secure in their explanations. Do not, under any circumstance allow a quantum mechanic to repair your car.

Alan Alda has one of the beutiful voices in cinematic history i know of. He is truly inn the likes of Swaggersoul

"Imagination is more important than knowledge" because imagination GETS YOU TO KNOWLEDGE.

I love this stuff so much.... when I was younger I didn't have much interest but now I find this very intriguing

Correct me if I am wrong but what Dr Greene is explaining can also be explained by Newtonian Relativity i.e. in free fall, within the falling frame you experience no net force.

General Relativity: G(F/m)(H/m) = 7.426157905 x 10^-28 m/Kg. Special Relativity: (F/m)(H/m)c^2 = 1.

Gravity is clearly an emergent force as per #Verlinde . It's becoming more and more clear that what Einstein said, that Quantum Mechanics is "incomplete," is undoubtedly correct. .

Brian talks like he's about to sneeze.

Dear Publisher, Please make following corrections: at 14:30, acceleration does not bring "Gravity" into "existence", Gravity was still there, acceleration makes it perceptible, i.e. it brings "Gravitation" into our perception.

All he explained in the video and experiment was simple high school physics, and still the audience seemed so impressed.

It's 2018 and 107 flat earthers have disliked this video.

Alan Alda!

11:28 is why I had trouble in 2020's AP Physics C: Mechanics first problem!

Great interview

Starting to wonder what if the uncertainty in quantum physics is somehow tied to our consciousness. What if our thought/choice itself is the hidden variable upon which all these mysterious phenomenon are taking place?

These guys are good. I already knew all that science, but I did not know it could be presented that well.

everything is flowing electro magnetic pressure, sometimes through unperceivable scales

6:45 The German words for 'spooky action at a distance' would be 'gespenstische Fernwirkung' or spukhafte Fernwirkung'. Both translations can be found in the German literature. That is because the paper where the term was first used was written in English. Einstein had emigrated from Germany and he lived and worked in princeton when the paper was published. We can't be sure if the term really was coined by Einstein himself. The paper has three Authors. Albert Einstein, Boris Podolsky and Nathan Rosen. It was written by Boris Podolsky, most probably because of the three, he had the best command of the English language. In a letter to Heisenberg Einstein later expressed his dissatisfaction with the published version of the article. So maybe he would not even have used those words.

Generally, I like Brian Greene, he knows his stuff but his commentary is a bit confused. Einstein's problem was indeed with non-locality, (*not* with determinism, or entanglement), entanglement just implies some correlation, not causation, and Einstein rejected non-local hidden variable theories, like David Bohm's. His position was that determinism and hidden variables would follow as a consequence of the principle or locality. Of course, we now know Einstein was wrong, not because of any experimental confirmation of entanglement (much less spooky-action-at-a-distance) but because of Bell's inequality theorem. I think it would be more accurate to say Einstein hated the Copenhagen interpretation, rather than quantum mechanics, as-a-whole. Unfortunately, those two are used interchangeably.

That water bottle tipping over at the beginning bothered me for the rest of the video

Einstein awarded Feynman and Schwinger a substantial cash prize for quantum mechanics.

6:46 -- "spukhafte Fernwirkung" . . . in which "spukhafte" may mean something more like "ghostly" (in the sense of not material . . .)

What's the Spooky word in German is stupid question! Every word in German is spooky :P

the two creatures who disliked this video should not exist on Earth

Time also appears in this business of acceleration, or energy levels and motion. However, there is one concept missing: infinite complexity. Why? it's not math.

Explanation 👌🏼

Yet we still dont have a distinct quantum theory for gravity.

Alda's voice doe

The water does not leak for the container when it is dropped cause the water and container are dropping at the same constant rate

Normal calculation: 2+2=4 Quantum computers: Perhaps...

So Newton was dropping apples and Einstein was dropping people out of windows. 🤣

I don't think Einstein was wrong about the quantum mechanics. I think what Einstein was trying to figure out was a theory that is able to describe the motion of subatomic particles when they were not interfered by human observation. Once observed, the particles are already interfered by human being's observation. Quantum mechanics best describes the subatomic world only because it can explain the result of experiments, which are all human intervention. In my humble opinion, quantum mechanics works but still a superficial theory. A deep, fundamental theory should be just one theory that explains all.

Very important comment by Brian Greene in the last paragraph of this video: "Einstein didn't use acceleration in his formulas for special relativity"! Many people forget that, even physicists when they try to explain time dilation and other special relativity effects. There are only relative speeds and different observer positions, but never acceleration. That is why special relativity only talk about energy increase of objects close to c, not mass increase as many also get wrong.

I wished this guy was my professor in college ❤️