Lots of medicines are found in nature. But why? What do these chemicals do for the organisms we find them in? The answer is often surprising. Like trabectedin, a chemotherapy drug made by a sea squirt. Or eptifibatide, a blood thinner derived from snake venom. Or ziconotide, a pain killer made by a sea snail. Animations by Dom Burgess. His brilliant channel, Every Think, is here: https://www.youtube.com/channel/UCGI000V6ZIAQf97MNybAaLQ His video about going to Mars is here: https://www.youtube.com/watch?v=a6qMaA4G3zU The video I made with The Body shop is here: https://www.youtube.com/watch?v=8bHfQeZ-MwI First poppy image credit: afgooey74 on Flickr https://www.flickr.com/photos/24102780@N03/3702843836 Second poppy image credit: Laughlin Elkind on Flickr https://www.flickr.com/photos/wurzle/2167828533 Submersible image credit: OAR/National Undersea Research Program (NURP); Univ. of Hawaii Patreon: https://www.patreon.com/stevemould Twitter: https://twitter.com/moulds Instagram: https://www.instagram.com/stevemouldscience/ Facebook: https://www.facebook.com/stevemouldscience/ Buy nerdy maths things: https://mathsgear.co.uk/