Hrm... not sure how historic they are, but I has a few~
Albert Einstein - Well, he's Albert Einstein. I was a bit obsessed with him a few years ago hehe. *And kinda dressed up as zombie Albert Einstein for Halloween once*
Nikola Tesla - I discovered him while reading some comics and stuff on The Oatmeal, and after reading and seeing a few more things about him, I can say this dude is awesome. He really deserves to be a bit more popular, I hardly hear anything about him.
I have a few others as well, but these were the first that came to mind :3