It’s All In Your Head (with apologies to INXS)

While it’s true that (most of) physics views the math as working both directions where time is concerned, this becomes untrue where the laws of Thermodynamics is concerned. This being Entropy, Decay, Age related breakdown, etc. Nuclear breakdown of atoms from radioactive to eventual decay to other elements. The reverse does not happen, so “Time” in our reality is Real on this level.

The idea of Time travel, then is to work around this concept of Entropy.

 
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