600px-No_Organics_Zone_Circles_Pinwheel_GalaxyWayt Gibbs, contributing editor to Scientific American, kicks off a special physics and astronomy issue that has stories on time travel, the origin of the universe, and human intelligence. Wayt (@WaytGibbs) will blow you away with his own piece on two invisible black holes circling each other furiously at the center of a distant galaxy. photo: NASA