Why do wounds itch?

06 July 2012
Presented by Chris M. Smith, Redi Tlhabi

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A comparative picture of untreated 7-days-healed road rash in the form of a scar one year later. Fresh wound is on the right, and scar is on the left.

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What does the discovery of the Higgs particle mean? How do flies land upside down on the ceiling? What happens when we divide by zero? Why do healing wounds itch? Does my washing dry by osmosis? How do fibre optics work? What causes a headache?

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