'Sweaty billboard' could help fight Zika.

A billboard that attracts and kills mosquitoes has been designed by marketing agencies in Brazil. The board releases a mixture of a lactic acid solution that mimics the smell of human sweat, and carbon dioxide, which is in human breath.At night, fluorescent lights increase the attraction. The mosquitoes get trapped in the display, later dying from dehydration, according to the project. Its inventors have released the blueprint for free and are encouraging people around the world to make them. However, one expert warned it could attract insects to areas where there are many humans. The mosquitoes the billboard targets fly around four feet high, the trapping mechanism is located at that height. It can attract the insects from a distance of up to around 1.5 miles, the Mosquito Killer Billboard site says. The Brazilian project was created by the ad agencies NBS and Posterscope. read more www.bbc.com