When in between exoskeletons, blue crabs rely on an inner hydrostatic skeleton to move about.
Smooching feels good, of course, but couples first started swapping saliva as a way to test out genetic compatibility.
We break through all the reindeer hype to tell the true story of these fascinating animals.
Our eyes sometimes play tricks on us because our brains have evolved to see patterns, even where there are none.
It's a gas! Air consists of nitrogen and oxygen and lots of empty space.
Here's how to undo the damage caused by tooth decay:
Problematic pregnancies that required assistance revolutionized child delivery for early humans.
Earthworms are taking a bite out of forest ecosystems.
Beluga whales are helping scientists plumb the icy depths of the Arctic.
Now extinct, plesiosaurs were predatory creatures that haunted the deep seas.