Constructor theory

“What happens to the concept of "heat" when a system is so small that a single atom acts as the entire engine?”

“counterfactuals”

“Loschmidt's paradoxen.wikipedia.org. If you were to film the motion of all these bouncing atoms and run the movie backward, the reversed motion would perfectly obey every law of physics.”

“If you record the exact position and velocity of every single atom in a cold room, that specific chaotic state is incredibly rare.”

“If a constructor must remain unchanged after performing a task, can a perfect constructor actually exist in our universe, or are they only approximations?”