How does pepper spray work?

Why can't I eat fruit? How does marijuana affect your brain? How does pepper spray work?...
02 December 2016
Presented by Chris Smith with Redi Thlabi. 

CHILLIES

Red chilli peppers

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Why can't I eat fruit? How well do polar bears smell, and how do we know? How does marijuana affect your brain? How does pepper spray work?

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