Water Bears are some of nature's most durable microscopic creatures, capable of surviving almost anywhere, including the vast reaches of space. They are also extremely cute and have inspired a song by the band, Ekoostik Hookah.
(Thanks, Robin Kolnicki!)
Maggie Koerth-Baker is the science editor at BoingBoing.net. She writes a monthly column for The New York Times Magazine and is the author of Before the Lights Go Out, a book about electricity, infrastructure, and the future of energy. You can find Maggie on Twitter and Facebook.