Why am I left-handed?

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<p>Neal Shepperson asks, "What determines left or right handedness and why are us lefties in the minority?"</p><p>One in ten people are left-handed, but where does this ratio come from and when did it appear in our evolutionary past?</p><p>Hannah talks to primatologist Prof Linda Marchant from Miami University about why Neanderthal teeth could hold the answer.</p><p>Prof Chris McManus from University College London tells Adam about his quest to track down the genes responsible for whether we're right or left handed.</p><p>But does left-handedness affect people’s brains and behaviour? Some researchers point to a link between left-handedness and impairments like autism or dyslexia. Others claim that lefties are more creative and artistic. </p><p>So where does the answer lie? The team consults Professors Sophie Scott, Chris McManus and Dorothy Bishop to find out the truth about left-handers.</p><p>If you have any Curious Cases for the team to investigate please email <a href="mailto:curiouscases@bbc.co.uk">curiouscases@bbc.co.uk</a></p><p>Picture: Left handed child, credit: Diarmid Courreges/AFP/Getty Images</p><p>Presenter: Adam Rutherford &amp; Hannah Fry</p><p>Producer: Michelle Martin.</p>