The Big Bang, the single point in space and time from which all matter and energy in the universe supposedly emanated, is thought to have occurred sometime around 13.7 Ga...
The Late Paleozoic: Responding to CatastropheLast Updated on 2012-08-22 at 14:54
Every major catastrophe seems to provide opportunities for new biological life forms. So it was with the Ordovician–Silurian Extinction. Up to that point, life had been... More »