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Peep Show: Watch Us Calculate The Speed Of Light With Stale Easter Treats
Alchemist Hennig Brand looks focused, if maybe a bit drained, in this 1795 painting by Joseph Wright. The painting depicts Brand's discovery of the chemical element phosphorus. Joseph Wright of Derby/Wikimedia hide caption
Josephoartigasia was a cow-size rodent that lived 3 million years ago. Mary McLain/NPR's Skunk Bear hide caption