Is there any evidence showing how the nature of time works backwards?

I do know that unscrambling eggs is damnably difficult.

There are some blind studies which seem to show that test-takers who are told (independent of their test results) to study for the test after the test happens, scored higher. (Cue Twilight Zone theme) Seriously.

You have just discovered T-symmetry. Richard Feynman gives a perfect explanation of the symmetry laws in Part 5 of The Character of Physical Law.

He also demonstrates that friction and resistance can be time-reversible in addition to projectile and planetary paths.

@Vortico
I want to have your babies.

@kingpinlovesyou Take them.

@kingpinlovesyou, this is one of the greatest mysteries.

At the level of particle physics, the physics work the same backwards or forwards in time. Vortico mentioned T-symmetry but a more complete version is CPT (Charge-Parity-Time) symmetry. Basically, if you take any particle and (1) switch its charge, (2) mirror it in space, and (3) send it backwards in time, it looks exactly the same.

Weird, huh? Except that on the level of our experience we know that the past is different from the future. We can remember the past; we can’t remember the future. Entropy clearly has something to do with it. It’s a lot harder to make scrambled eggs than it is to turn scrambled eggs back into 2 whole eggs.

One of the reasons this difference pops up on the macroscale, and not on the microscale, is probably related to the very nature of entropy. Entropy is meaningless for a single particle. Entropy only exists if you have groups of particles that can form particular arrangements. Or to put it another way, say you have a single 6-sided die. Any roll is equally probable, so it’s not very interesting. But say you have two six-sided dice. Now entropy comes into play, because there are certain macro-scale patterns of rolls that are more probable than others. For example, rolling a 7 is very probable; rolling a 2 or a 12 is the least likely.

This “gradient” of probability that emerges when you have more than one thing going on—entropy—probably has something to do with the arrow of time, and some physicists have explicitly said that the arrow of time is derived from entropy. But as far as I know, nobody’s convincingly explained why entropy was low in the past, which is the big mystery.

I’m not sure whether time goes backwards or forwards, but I do know this:

”...One of the seats of emotion and memory in the brain is the amygdala, he explained. When something threatens your life, this area seems to kick into overdrive, recording every last detail of the experience. The more detailed the memory, the longer the moment seems to last. “This explains why we think that time speeds up when we grow older,” Eagleman said—why childhood summers seem to go on forever, while old age slips by while we’re dozing. The more familiar the world becomes, the less information your brain writes down, and the more quickly time seems to pass…”

Read more

.sdrawkcab gninnur emit fo ecnedive yna nees reven e’vI.

!rehtulf ot emoclew…WTB

Time is a measure of the “distance” between two events. It only has meaning if there is a starting point. It only moves the direction of the next event. The previous “distance” does not actually exist anymore, other than as an artifact for studying the past. Time itself does not go backwards.

“Time is a measure…”

Exactly why I believe that time is a human construct. All measurements are human constructs.

@RealEyesRealizeRealLies What other critter that you know of measures things. Just curious.

None that I know of that fashion a tool to measure. The bee encodes distance to the pollen with the figure 8 waggle dance, but does not fashion a tool beyond that language to do so.

Perhaps I should have stated that all measuring tools are human constructs.

Primates fashion tools to pull ants out of the ground. But I have no knowledge of an animal that fashions a tool to measure time.