Court and other government documents are often presented with redactions -- that is, with some text blacked out or otherwise made unreadable. Learn how this is done -- and why -- in today's episode of BrainStuff.
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What Would Happen If You Swallowed a Leech?
08:38

How Can Rhubarb Grow in the Dark?
10:28

How Does the Blue-Footed Booby Work?
08:41