This is why he's a professor

its not that hard to do

That's Walter Lewin of MIT, and the dude is just top choice mental floss...a total academic tour-de-force. His mathematical and scientific prowess would humble anyone. His lectures are profoundly dense yet gracefully magnificent. So, in turn, his chalk skills are the climactic conclusion to eons of human evolution and philosophical dissertation. Moreover, he's the coolest lookin' dude at MIT.