“Figure out the past state from the current state”. Or at least some close approximation of the past state.
Which involves attempting to time-reverse the laws of physics, on some level. Which is impossible, strictly speaking, but you may be able to get close enough for government purposes.
“Figure out the past state from the current state”. Or at least some close approximation of the past state.
Which involves attempting to time-reverse the laws of physics, on some level. Which is impossible, strictly speaking, but you may be able to get close enough for government purposes.