Before today, I would have never known who William Rowan Hamilton was. The only reason that I now know of him is because of a fantastic singing video about him. (It's a cool video, you should watch it!) Hamilton was an Irish mathematician in the 19th century who made many contributions to optics and classic mechanics. He was crazy smart. He spent his youth learning languages and then at 15 went on to discover an error in a physics theory along with contributing to other ideas. Hamilton discovered a number system that extends the complex number system as well. (ijk=-1) Overall, he was a pretty cool guy that now has a pretty cool song.