RT @DanielPink: Babies cry at night to prevent siblings, scientist suggests https://t.co/Z3QFfgEZPD

Babies cry at night to prevent siblings, scientist suggests https://t.co/Z3QFfgEZPD

— Daniel Pink (@DanielPink) April 26, 2014

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April 26, 2014 at 11:43AM

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