A new study has revealed that a lucky 15% of the population produces their own midge repellant. Researchers from Aberdeen University and Rothamsted Research studying the feeding habits of the Scottish biting midge found that those were spared bites produced a specific mixture of two chemicals, geranylacetone and methylheptenone. The researchers hope that the results will eventually lead to the developement of a new repellant based on these chemicals. The research was conducted during peak midge season and involved over 300 contestants and spectators at the Loch Ness Duathlon. It also found that tall men and larger women with a…