Spiny on the outside and gooey on the inside, sea urchins are a weird and wonderful animal -- and delicacy. Learn more about them in this episode of BrainStuff.
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How Did the Smallest Primates Get Such Big Eyes?
08:27

What Would Happen If You Swallowed a Leech?
08:38

How Can Rhubarb Grow in the Dark?
10:28