Pop quiz: what is bright blue, has barely changed in the past 450 million years, and sells for $15,000 per liter? Answer: horseshoe crab blood, which is used to make sure injected drugs aren't contaminated with bacteria. Hank Green explains below. So cool! --Ryan Cooper
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Primatologist Jane Goodall dies at 91Speed Read She rose to fame following her groundbreaking field research with chimpanzees
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White House seeks to bend Smithsonian to Trump's viewSpeed Read The Smithsonian Institution's 21 museums are under review to ensure their content aligns with the president's interpretation of American history
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CBS cancels Colbert's 'Late Show'Speed Read 'The Late Show with Stephen Colbert' is ending next year
