GLAMORGAN - Chantelle Coleman has taught herself to speak German at the age of four. Britain's youngest member of Mensa first heard German three months ago, but is almost fluent now and has been interviewed on German TV. It all started when a German magazine heard about Chantelle's membership of Mensa and flew a team over to her home in Wales to interview her. She has an IQ of 152, seven more than genius level.