[eichin]

Given that gravity has been observed to work on antimatter the same way as it does on normal matter, doesn't that refute this? or is there another aspect of symmetry that keeps it consistent?

[contravariant]

Ballistic trajectories look identical whichever way you travel in time.

[dekhn]

Are you saying "the laws of mechanics are time reversal invariant"?

[haneefmubarak]

Except for entropy, aren't they for the most part?