Why are some people left handed?

We find out if other animals exhibit handed'ness. Plus what does it mean to be left handed and right footed?...
17 February 2014
Presented by Hannah Critchlow

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Greg Roberts shot this photo of his son while running a beta version of a computer vision algorithm trained to detect hands.

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We find out if other animals exhibit handed'ness. Plus what does it mean to be left handed and right footed?

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