Can you stop a yawn with a finger?

Why are babies tummies always swollen? Do our brains function at 100%?
08 May 2015
Presented by Chris Smith, Redi Tlhabi

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Baby Yawning

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The Naked Scientist answered listeners' weird and wonderful questions including: why babies tummies look swollen; why we vomit if others vomit; and how effective are sleeping tablets.

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