"he uses more than ten percent of his brain." they actually proved on mythbusters that you do use more than ten percent of your brain. i think that it's illusions, but only some of it. idk about alot...
No the're not. He is just very good with sleight of hand, and manages to create some good gimmicks which make his tricks possible. If you go onto youtube and type in "David Blaine magic tricks...
It is a trick. He had a tube attached to his head which could easily have supplied oxygen in some manner. Also, he was wearing a bulky suit of some kind which could hide other life support...