human pulls off lizard tail trick

"a man cut off his finger tip while working on a model plane. his brother, a medical research scientist, sent him a vial containing powdered pig bladder and told him to sprinkle on the severed finger tip. it grew back -- "flesh, blood, vessels and nail" -- in four weeks. "

via boingboing

reminds me of this stuff made from some part of a cow. soldiers use it, and it's becomming available to the public. i've considered getting some for my friends on broad st. who deal with a lot of gun wounds (some fatal.) it might work, although some claim direct pressure on the wound is superior.