There are naturally occurring toxins on Earth that are SO poisonous that one drop could kill thousands of people. How is that possible? What about their chemical makeup makes them so poisonous? Join Hank Green for an exciting look into the dangerous world of natural toxins. Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Tardigrade Poster: http://vid.io/xom SciShow Mug: http://vid.io/xoa SciShow Shirt: http://vid.io/xog -- SciShow elsewhere on the internet: http://www.facebook.com/scishow http://www.twitter.com/scishow http://scishow.tumblr.com/ References and image licenses for this episode can be found in the Google document here: http://dft.ba/-5jCx