A Swede who researched into why blonde women's hair turned green is one of the winners of this year's igNobel Prize.
Johan Petterson, an environmental engineer for Trelleborg local council in southern Sweden, was contacted after mostly female residents in the village of Anderslöv suddenly all got green hair. He discovered that the cause was hot water that had stood too long in the copper water pipes. He also discovered a cure, he told the audience at Harvard University, either moving the women to old houses, making them shower less often, or making them shower in cold water.
For the discovery he wins a share of the igNobel Prize, awarded each year at Harvard University, for more unusual scientific discoveries.