Is your glass half full? Chances are that it is, along with those of 80 per cent of the general population - we're an overwhelmingly positive species.
At the Wellcome Trust Centre for Neuroimaging, Dr Tali Sharot is one of the leading scientists teasing apart the neurological correlates of what we call optimism. In this film, find out how a happier disposition not only helps us get through the day, but may even be key to our evolutionary success.
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