When Gilette asked "How does the Man of Steel shave?", lots of celebrities took notice and came out to play the guessing game. (Okay, so they were probably recruited and paid by Gilette to do it. Just go with the premise!) Earlier today, four theories went live at the "How Does He Shave?" site. We already talked a little bit about the Kevin Smith entry, but there's more to it than just that. Bill Nye, the Science Guy postulates that Superman doesn't cut his hair when he shaves, but rather grinds it off, allowing him to shave with something not as strong as his hair, but sturdier and with a "wider, stronger footprint" to basically knock the hair off rather than severing it.