For those still confused, the idea of "entropic time" is that entropy is the only thing (in classical physics at least, my knowledge of quantum mechanics is very poor) which actually cares about a direction of time. That is to say, if I show you a video of a ball flying through the air, you can't know if I reversed the video, because the laws dictating its motion work the same forwards and backwards. However, you can obviously tell that the videos that AcapellaScience used in his video are played backwards. Why is that, if the laws of physics are time-symmetric? The answer, in short, is entropy, which essentially means "disorder". The 2nd law of thermodynamics says that entropy in a closed system will always increase over time. For instance, if I put a drop of food coloring in water, it starts out "ordered", with all the dye separated from all the water. Over time though, the dye will disperse until it is more or less evenly distributed. This is a state of high entropy because each part of the solution is the same as each other part. The important thing though, is that there's no actual asymmetry to the *mechanics* governing the dye. If we could somehow start the dye already mixed into the water, but with motion exactly opposite to how they ended up in the first experiment (every atom in the same position but moving the opposite direction), we would see the dye re-form into a drop. The fact that this never actually happens is the one thing that lets us tell which direction of time is "forward", with "forward" meaning "towards the direction of increasing entropy". The question that this video ponders, and one which I have no good answer to, is *why* entropy only increases in one direction, if all of the laws of motion that actually act upon particles are time-symmetric.

You absolutely need to see his commentary video for this song. It is even more amazing than you think.

To answer how time is moving backward but his mouth is moving forwards, the answer is that he sang the song backward and reversed the video. To see how he made it, watch this video: kzread.info/dash/bejne/Z2iio7GadcjFdto.html To see what the camera recorded, watch this video: kzread.info/dash/bejne/h5mjzJarh9jLhrw.html

1:01 - the moment you first start to realize what’s really happening here.

So clever & well done, *& really good harmonizing too. X

David Pogue put me on to this video quite awhile back. So when I saw you were reacting to it, I knew we were both in for a treat.

Amazing well done. 😁

Dude, this is the best way to teach... time does not actually exist, is just a measurement for ourminds. Loving finding you today, thanks, subbed. Truly watch ' more than birds.' parody of more than words from Extreme. Brillian just bloody brilliant. I would sing that to pick up chicks back then if i could.

@dacomputernerd4096

10 ай бұрын

A song about the evolution of birds seems fitting for picking up chicks lol

We love you Tim from Caleb your nephew ❤

hu there i have a question why have you never send a thai band like body slam like this song like this 1 MV - แสงสุดท้าย bodyslam

@HighlyCombustibleReacts

2 жыл бұрын

It's nothing against the Thais Jeffrey. It's just that I live in Thailand, where they do not necessarily have free speech per-say. Here, computer crimes are very serious. Content creators are also responsible for every single comment on their platform. I honestly just do not want to be responsible for anything that may come up in the comments section on any of the videos. When I am once again elsewhere, I may start doing Thailand (because I can speak conversational Thai for the most part). I too love the music here, I just don't like any of the politics.

@jeffreyheidstra74

2 жыл бұрын

kzread.info/dash/bejne/gYGqq6ueebCqg5s.html

@BennoWitter

2 жыл бұрын

@@HighlyCombustibleReacts They are very touchy about their king. Even though he spends most is his time in Bavaria and took most of his valuables with him in case there is an uprising in his country. But, I'm sure he is a nice guy.