I have just watched episode (No. 32) of Mythbusters on the Discovery channel, and they were putting the myth of the pyramides on test. Tory puts his face on the line for this myth by shaving each day with two razors - one kept in a pyramid, and one kept out of the pyramid. He shaves the right side of his face with the pyramid razor, and the left side with the other. Ofcourse, at the end, they were both dull the same amount, and they viewed the razors under electrone microscope with (IIRC) 12000 power. The pics were awesome, showing details I have never seen before. The edges looked like they were made from dry grass(?) bunched together...