|What then is time? If no one asks me, I know:
if I wish to explain it to one that asketh, I know not.
Augustinus, Confessiones, 11. Buch, 14. Kapitel
examples you can understand here the thoughts physicists developed to
approach this puzzle. They probably will appear quite strange to you,
and you will have to give yourself a bit of time to think about them.
Now return to the videos.
Try and find relations.
If you want to dig deeper, read on about "Entropy".