Spiders have been a plague on the earth ever since they marched their eight feet out of hell. In some areas, spiders have been known to cocoon entire trees. And it turns out there's a benefit to their efforts.
Put this one in the "We'd feel bad about it if they were mammals" files. With dengue fever infections on the rise and two fifths of the world's population at risk, scientists devise a scent trap that kills pregnant mosquitos.