you can get them on ebay and i thought of bringing one with don torricelli realized that tsa would probably tackle me at the gate. so i said no, i'm not going to do that. [inaudible] >> exactly. this is called sleam. if you notice there is a notch on the side and that's a notch, not the long played that is used to cut. it's the knowledge that's used to puncture blood vessels for bloodletting. we're going to talk about bloodletting. it is a practice that is going on for hundreds and hundreds of years. nowadays we sit in movies. we scratch read and wonder that person is really sick of want to do is pump two pints of blood out of them when they need upload. especially now in most physicians realize we do as much as we can to keep peoples blood in them and not spill if we don't have to. but why did this happen for so long? it really was a main part of medical therapies for a long, long time. it goes back to the ancient theory of medicine. this is a bit of a graph that shows you some of the concepts. they believed, this is from the time of hippocrates so hundred year bc. the human body, the heal