Why do I get a stitch when I exercise?

Why do I get a stitch when I exercise? Why do ropes get tangled up in knots?
27 February 2015
Presented by Chris Smith, Redi Tlhabi

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Why do I get a stitch when I exercise? What determines our body temperature? How quickly do fruit and vegetables lose nutrients after they are picked? Why do ropes get tangled up in knots? Can you get stuck together during sex? Plus, news of an edible gene therapy to control insect pests...

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