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In 1919, a dozen teams of aviators set out to conquer the Atlantic, racing from Newfoundland to Ireland through fog, storms, and ice. Some crashed, others vanished, but two pilots, Harry Hawker and ...

DNA shines a light back into the past, showing us things that fossils can't. But how far back can that light extend? Some of the oldest DNA sequences come from mastodon and polar bear fossils about 50 ...