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Why Earth’s Magnetic Pole Reversals Are So FascinatingA rare geological event occurs every 300,000 years or so: the Earth’s magnetic poles flip. The magnetic poles are the two ...
Watch Nigel Freeman appraise a 1947 Max Ernst "Dangerous Liaisons" etching in Crystal Bridges Museum of American Art, Hour 1. Antiques Roadshow is available to stream on pbs.org and the free PBS ...
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