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DownwindFrom 1951 to 1992, the U.S. government tests more than 900 nuclear weapons on American soil.

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Now PlayingDownwindFrom 1951 to 1992, the U.S. government tests more than 900 nuclear weapons on American soil.0Ocean WondersTom Hird reveals the secrets of a sea urchin's spikes, swims with tiger sharks to see if they can sniff out blood from a mile away and shows how cuttlefish change color in a flash.