What is an itch?

After telling us how the bubonic plague bacterium, which wiped out half the population of Europe in the middle ages, has had its DNA decoded as...
14 October 2011
Presented by Chris Smith, Redi Tlhabi

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Where do allergies come from? What "actually" is an itch? What is meant by matching a donated organ? Why do veins distend on a hot day? What causes floaters in the eye? Join Dr Chris for the answers to this week's fast and furious barrage of questions, as well as news of the origins of the plague...

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