By: Stephanie Pappas
Published: 02/05/2015 10:15 AM EST on LiveScience
Babies who are just over a year old already comprehend complex social int...
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By: By Tia Ghose, Staff Writer
Published: 01/10/2014 02:20 PM EST on LiveScience
Babies as young as 9 months old know that friends usually have ...
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