Does that bearded man look familiar to you?
That's Charles Darwin...you know, the guy who came up with the theory of evolution by natural selection? Yeah, him... on official currency!
Mr Darwin was born in 1809. In commemoration of his 200th birthday (and because his beard is too awesome to be on only one piece of currency), The British Royal mint struck a limited edition £2.00 coin in 2009, of which I have only ever come across once.