March 5, 2012

This just in from Popular Science, link here. Massive Extraterrestrial Rock Hit Earth 13 Millennia Ago, According to Nano-Evidence About 13,000 years ago, a chunk of a comet or asteroid hurtled into the atmosphere at a shallow angle, superheating the atmosphere around it as it careened toward the surface. The air grew hot enough to ignite plant material and melt rock below the object’s flight…