Scientists at Bradford University believe they have uncovered the root cause of why hair turns grey. It is an accepted part of the ageing process, but experts say understanding how grey hair happens could help find a way to prevent it. Experiments found it is caused by a massive build-up of hydrogen peroxide due to wear and tear of hair follicles, which blocks hair’s natural pigment. The research has been hailed as a "major breakthrough." Read the rest of the article March 5, 2009