Scientists from Brown University (US) demonstrated that clothes lined with graphene-oxide (GO) could protect users from mosquito bites. According to a study published in the journal Proceedings of the National Academy of Sciences (PNAS), GO blocks chemical signals in human sweat that mosquitoes use to sense the proximity of blood. Tests on volunteers proved that the ultra-thin material is strong enough to work as a physical barrier and mosquitoes cannot bite through when the material is dry. Scientists are now studying a way of stabilizing GO so the material can also be resistant when wet.