The laws of physics governing the motion of molecules are time-symmetric – they make no distinction between past and future. If by some magic all the molecules in a box of gas had their velocities simultaneously reversed, the box of gas would heat up at one end and cool at the other. There is nothing in the laws of motion themselves to prevent heat flowing from cold to hot, in violation of the second law of thermodynamics. The reason we don’t see such bizarre sequences of events is because of the initial conditions. The gas in the above example started out in an ordered state, with heat energy distributed unevenly. To explain the arrow of time in the box of gas we need to explain how it attained its initial state.News, “Physicists assume everything is reversible in principle — but time isn’t. Why not?” at Mind Matters News
Here are some time-related conundrums imagined as short science fiction films reviewed at Mind Matters News:
What if a loved one aged much faster than you? – Sci-fi Saturday It’s one of the implications of faster-than-light travel (8:19 min). Should youthful Cpt. Bernhard take her now very old husband to the new Earth, Gaia? That’s the emotional and ethical dilemma in ARK.
If it’s real, it must be endured. (8:47 min) “It’s Okay?”, using futurist technology, takes a woman back through her time with someone she loves. This short sci-fi film plays around with time — and neatly and deftly avoids the common shortcoming of becoming just plain confusing.
In a Future Market, Time To Live Is Bought, Sold (10:57 min) An employee wants to rebel against the greed and injustice but then she would run out of time … “The Bargain” raises some issues — as a thought experiment — that appear in real life in the illegal organ trade