Why do we believe in luck

Is there such a thing as a lucky person or a lucky streak? And does belief in good and bad luck play a part in whether we are prepared to take chances, asks Megan Lane.

I won a pair of cinema tickets recently. Then a free haircut. While sceptical about luck, I couldn't help but wonder if it might run in threes.

This is the way Megan Lane starts her article on luck on the BBC website. Read the article to find out more about it, and don't miss the three-minute video by Professors Mike Aitken and David Spiegelhalter on how to measure risk and on the real existence of luck.