Laplace's Demon

Laplace's Demon is a thought experiment about a hypothetical, infinitely knowledgeable being who knows the precise position and velocity of every particle in the universe. If such a being existed, it could predict all future events and retrodict the past perfectly, because the universe follows deterministic laws. Essentially, it suggests that if complete information about the present exists, then the future is entirely predetermined. This concept highlights debates about free will and determinism, illustrating the idea that the universe’s future might be predictable if everything’s initial conditions were fully known.