Margolus–Levitin theorem

The Margolus-Levitin Theorem is a theory about how much energy something needs to do something. It says that if you want something to do something, like move a toy car, it needs to have a certain amount of energy. It's like filling up your car with gas before you go on a road trip. Without fuel, you won't be able to go anywhere. So, in the same way, the Margolus-Levitin Theorem says that if you want something to do something, it needs a certain amount of energy to make it happen.