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Why Is Ocean Water Salty?
Today’s Wonder might be the saltiest you’ve ever SEA-n!
Why Is Ocean Water Salty?
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Who Invented the Hula Hoop?
Head to Wonderopolis today to join all the movers and shakers for a hoopin’ good time!
Who Invented the Hula Hoop?
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Who Was Clara Barton?
Do you believe in angels? Join us in Wonderopolis today to meet the woman Civil War soldiers called “the angel of the battlefield.”
Who Was Clara Barton?