Is That Wasp Nest … Glowing?
On a muggy spring night in 2016, the chemist Bernd Schöllhorn was tromping alone through a forest in northern Vietnam. Into the inky darkness, he raised a black light—and saw an extraordinarily bright shape winking at him in eerie shades of yellowish green.“I thought it was somebody else,” Schöllhorn, a researcher at the University of Paris, told me. But when he cut his own light, the stranger’s torch instantly extinguished as well.





























