We may not have mutant powers like the X-Men, but natural selection is still changing humanity… for the better. Learn about some of humanity's most useful modern mutations in this classic 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