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Five young American inventors collaborated on the creation of a water-filtering bike which cleans water to drinking standard as you ride, and which could potentially revolutionise water safety in the developing world. Two of the inventors explain how it works.

Also on the programme: Do we need to change our mind about robots - one inventor explains why he the notion of them being humanoid and a potential threat to humanity is out-of-date. Plus, why babies are being brought to secondary schools to teach kids anger management.