Jan 25, 2014 (Weekend Edition Saturday) — It's been a bitterly cold winter in much of the country, but hey, it could be worse: You could have been alive in the 6th century. Starting in 536 A.D., scholars wrote of a cold snap that lasted not days, but years. Journalist Colin Barra speaks with NPR's Jacki Lyden about scientists' quest to determine what caused the epic cold spell.
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