One of the deadliest poisons known to man is now used to treat wrinkles, migraines, and even, maybe, depression. How did that happen? 

This is a special episode from <a href="https://www.vox.com/unexplainable">Unexplainable</a>  podcast from Vox and the Vox Media Network. 

Guests: 

<a href="https://carrutherscosmetic.com/about/meet-dr-jean/">Jean Carruthers</a>, ophthalmologist and “godmother” of cosmetic Botox. 

<a href="https://profiles.mountsinai.org/david-m-simpson">David Simpson</a>, neurologist at Mount Sinai hospital in New York. 

<a href="https://www.asklepios.com/ach/profil~prId=28655~">Axel Wollmer</a>, psychiatrist at the Asklepios clinic in Hamburg, Germany.

More than 154 million treasures fill the Smithsonian’s vaults. But where the public’s view ends, Sidedoor begins. With the help of biologists, artists, historians, archaeologists, zookeepers and astrophysicists, host Lizzie Peabody sneaks listeners through the Smithsonian’s side door, telling stories that can’t be heard anywhere else. Check out si.edu/sidedoor and follow @SidedoorPod for more info. 