Why do people have different accents?

16 June 2017
Presented by Chris Smith.

How do horses have such strong muscles if they never eat any protein? When dogs wag their tails, is this voluntary or involuntary? Does it save electricity to heat your water all day, or turn it off and on again? Why do we speak in different accents? How did viruses arise? Why do our noses run? Plus, new insights into TB.

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