Supercomputers are like brains, capable of doing many different things at once. Your brain does the equivalent of millions of calculations even for very simple tasks, like taking a drink of water. Your brain processes information and tells your body what to do: it sees where the cup is, tells your hand how far to reach, how tightly to grasp it and how to move it to your mouth. You might not even aware that your brain is doing all that work – unless you think about it!