Episode 12 - Likin' Lichens

Perhaps I'm channeling Sheldon Cooper a bit too much, but I am fascinated by lichens--those crusty organisms that form colorful mosaics on rock faces, cemetery stones, trees, and old fence lines. But here's what's interesting: thy are actually two organisms living as a single symbiotic creature, and they can survive under the harshest conditions imaginable--including in outer space.