大象传媒

Our evolutionary past can answer why we screw up our face when playing music, writing or using our hands for other tasks. Dr Gillian Forrester, a psychological sciences lecturer from Birkbeck University of London, explains where these links between our hands and mouth came from.

Digital producer: Jack Burgess
With thanks to Gillian Forrester (Birkbeck, University of London).

Image: Child painting and pulling a face Credit: Getty Images.