What name is given to the curved surface of a liquid as it stands in a tube, caused by surface tension? And what kind of creature is a great curassow?
Russell Davies is in the questionmaster's chair for the fifth heat in the current series. Aiming to become the 59th Brain of Britain champion are competitors from Aberdeenshire, the West Midlands, Berkshire and Essex. Today's winner will progress to the semi-finals in the new year.
There'll also be a chance, as usual, for a Brain of Britain listener to outwit the contestants with questions of his or her own.
Producer: Paul Bajoria.