PREMIUM --

Psychologist Dr Richard Wiseman, 34, (right) watches student Peter Costello, 17, dressed as a chicken (left) cross the road at the British Association's Festival of Science at Glasgow University. * Dr Wiseman is launching The Laugh Lab - a year-long, internet-based study to find the nation's funniest joke and explore the psychology of humour. The public are invited to log on to the site www.laughlab.co.uk and submit their favourite jokes and rate how funny they find other people's jokes.