The Principle Of Least Action

The Principle Of Least Action
Your mathematicians have discovered that whatever happens in the universe happens in such a way that the total amount of action is always the lowest possible. It's what they call 'The Principle of Least Action.' And your scientists use it all the time to predict how things will happen. Those balls the White Rabbit is throwing trace out a curve in the air, yes? Well that curve happens to be the one that involves the least amount of action. Any other curve you could imagine would require more action.

from Alice in Quantum Land via abuddha's memes