[marktwain]

It's got to have a forward drop. Otherwise Maxwell's Daemon could be made to do useful work.

I do not believe that is correct.

Persistence is not doing work.

A rock traveling through space preserves its energy. It is not violating entropy.

[Steely Tom]

We’ll see, as more comes out on this development.

The rock traveling through space continually encounters photons, with which it exchanges momentum.