Bubbling hot springs. Antarctic ice. Deep ocean trenches. The Himalayan peaks. Few organisms can live in any of these places, but the hardy tardigrade can survive them all. These tiny, eight-legged creatures can endure the most brutal conditions: dehydration, freezing, boiling, crushing pressure, and even radiation in outer space. Tardigrades are just about invincible!

Image credits: main image, © AMNH.