An Idaho company released a glowin- the-dark petunia called Firefly Petunia. By day, the plant looks like an ordinary white-flowered bedding plant. After the sun goes down, the plant reveals its superpower by emitting a faint green glow.While the glow is noticeable, it isn’t bright enough to keep your neighbors awake at night.Light Bio, Inc., a biotechnology company based in Ket...