Why does the placebo effect work?

Why does the placebo effect work? Why does scratching relieve itches?
17 July 2015
Presented by Chris Smith, Redi Tlhabi

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Why does the placebo effect work? Why do we get goosebumps? Why does scratching relieve itches? How can you fix bad breath? Why is it hard to wee if someone else is there? How long does food stay in the stomach? Plus, why screams are scary.

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