VIDEO: What does baby laughter mean for life?

Two of the cutest things that babies do are laugh and sleep but that laughter could actually have a serious side.

Researchers at the University of London have launched an online survey of what makes babies laugh and smile.

Claudia Hammond reports.

Article source: http://www.bbc.co.uk/news/science-environment-24576803#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa

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