Stressheads, your hair colour is one less thing to worry about: a new study shows that going grey is at least partly caused by genes, and not totally by stress or environmental factors. What's more, your eyebrows - or monobrow, if you have one - are also written in your DNA. An international team delved into the genome of more than 6,000 people with varied ancestry across Latin America, and dug out genes dictating the curl, colour, greying and balding of head hair, along with beard thickness, monobrow and eyebrow thickness. Lead author Kaustubh Adhikari, from University College London, says the findings published in Nature Communications could have forensic applications to build images of faces

Researchers say they've pinpointed the first gene linked with gray hair. They said the discovery, culled from a genetic analysis of more than 6,000 people of mixed ancestry in Latin America, proves that genes play a role in graying hair. "We already know several genes involved in balding and hair color, but this is the first time a gene for graying has been identified in humans, as well as other genes influencing hair shape and density," said study author Kaustubh Adhikari, from University College London, in England. "It was only possible because we analyzed a diverse melting pot of people, which hasn't been done before on this scale. These findings have potential forensic and cosmetic applications