Why do we yawn?

What causes itching? Can parasites manipulate our behaviour? Why do we yawn?
13 June 2014
Presented by Chris Smith, Redi Tlhabi

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Are mouth bugs nastier than bowel bugs? How would wiping out mosquitoes affect the food-web? What is an itch? Are anaesthetics a risk factor for blood clots? What are trans-fats and invert sugars? Can parasites manipulate our behaviour? Are there any benefits of yawning? Plus, news of the genetically-modified mosquito that might help to eradicate malaria...

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