Psychologists are checking birth dates with personality types, as they think lucky people are just more optimistic and take more chances.

They think things like temperature and what your mum ate when she carried you, which change through the year, could affect what kind of person you are.

The results will come out on 14 April. Anyone can take part in the test at www.luckfactor.co.uk.

Professor Richard Wiseman, who is leading the study, says they're not investigating star signs and astrology.

He reckons there might be a simple explanation, like how old you are compared to people in your class at school.