Despite their name, smartphones are a computer with a built-in phone. Now, go back to 1969 when humans first walked on the moon. The Apollo Guidance System was a computer. It was designed to allow the astronauts to control their spacecraft. It had a whopping 64k worth of memory. That's less than what's in today's toaster! Back on earth the computers used in mission control were the fastest available. They could do several hundred thousand computations per second. Today's smartphones can do over 3 billion a second. Of course, fifty years sit between 1969 and today. Still, this gives you an idea of how far computers have come.