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By studying the interactions of babies and their mothers, researchers determined that babies smile in hopes others will smile at them. Erika Beras reports
Learn more about your ad choices. Visit megaphone.fm/adchoices
By Scientific American4.2
599599 ratings
By studying the interactions of babies and their mothers, researchers determined that babies smile in hopes others will smile at them. Erika Beras reports
Learn more about your ad choices. Visit megaphone.fm/adchoices

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