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Salamone, a UConn Board of Trustees Distinguished Professor, has spent most of his career battling a particular long-held scientific idea: the popular notion that high levels of brain dopamine are related to experiences of pleasure. As increasing numbers of studies show, he says, the famous neurotransmitter is not responsible for pleasure, but has to do with motivation.

Dopamine might be the media's neurotransmitter of choice for scare stories about addiction, but the reality is rather more nuanced

Looks aren't everything but love, it would seem, is far from blind. Across cultures and sexes, some features hold greater appeal. "More symmetrical faces do seem to be rated more attractive," says Tamsin Saxton, a senior lecturer at Northumbria University and part of the evolution, perception and behaviour research group. "The theory goes that your genes provide a template for symmetrical bodies, symmetrical face. [When] there's some sort of problem - you get ill or you encounter some problem with the environment - that can sometimes throw the symmetry off a little bit," she says. "So it might be that if you are picking a symmetric partner then you are actually picking somebody whose genes are fairly well suited to the environment around you."