Plus, optimism actually makes you more attractive. The orbitofrontal cortex, the part of our brain that lights up when we look at an attractive face, activates when we see another person smile.

In fact, absolute symmetry can make people look pretty weird. When attractive celebrities' faces are made to look symmetrical, they don't look quite right. People tend to like faces that are ...

It might be their confidence, or their sense of humour, or you might just like the way they look. A lot of research ... and men may find women in groups more attractive. Some research has ...