Spending long summer evenings outside comes with a big nuisance: bug bites. Mosquitos and other insects are drawn to the lights illuminating your dinner party, which helps them hone in on their human prey. While that might mean a few days of itchy welts for some of us, the implications are much more dire in other countries where bug bites can mean infection of some nasty diseases such as leishmaniasis, Chagas disease, and malaria. Now, a team of researchers is experimenting with LED lights that can ward off insects but still appear as functional white light for humans. They published their findings in the May issue of the journal Philosophical Transactions B.