Why do wires tangle?

Why do wires tangle? How are mountains formed? Is borehole water drinkable?
25 September 2015
Presented by Chris Smith, Redi Tlhabi

Tangled headphones

Tangled headphones

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Why do wires tangle? Is borehole water drinkable? Does sea water evaporate? Why are there no more intelligent hominids except humans? How are mountains formed? What makes up non-stick linings on frying pan and are they safe? Plus, the Volkswagen emissions scandal.

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