>> quackery the term is actually a middle dutch word, classic silver which is a hocker. it's an old word that directly represents people who would stand on the street corners and try to sell their wares that maybe didn't work at all. but it's originally a dutch word. yes? >> i really don't think it's cracked up to be what you are advertising, but the part of leeches, there are people who collect leech jars. they used to make leech jars and you could buy them and you would store your leeches in those leech jars. there are many other things people use, take a venom from snakes, not snake oil but snake venom and use that to treat lots of diseases. there are still people who do that. >> yes, there are a lot of things we didn't cover in this book and that we didn't research but we know, it's deathly out there. after the leech jars they are very much available. again on ebay. i don't represent them and have no stake in ebay whatsoever, but you can find it and there are these beautiful jars with you would carry, keep leeches and carry them around with them. leeches are interest