Why does stress give me knots in my stomach?

20 February 2015
Presented by Chris Smith, Redi Tlhabi.

Why does stress give me knots in my stomach? Why don't I gain weight when I eat? How does sun cream work? Why does wheat give me gas? If we were to compress air to the pressure of water could we then swim in air? Do any planets stay still? Plus the science of popcorn.

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