When celebrities speak on science

Sense About Science has urged stars not to dip their toes into tricky scientific issues without checking their facts first.

Here are some examples put forward by the charity of dubious science uttered by celebrities - together with the views of its experts.

Celebrities must check their facts before lending support to scientific research and campaigns, a charity has said. Sense About Science director Tracey Brown told the Today programme that many claims ran the risk of misleading people.