When Did Americans Stop Marrying Their Cousins? Ask the World’s Largest Family Tree

When Did Americans Stop Marrying Their Cousins? Ask the World’s Largest Family Tree
When Did Americans Stop Marrying Their Cousins? Ask the World’s Largest Family Tree

By STEPH YIN from NYT Science http://ift.tt/2oztmIK

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March 02, 2018 at 10:16AM
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March 02, 2018 at 02:31PM