It was through a letter dated March 30, 1579 that Giovanni Arduino announced the four orders that form the basis of ...

Read More: Chronostratigraphy: How Scientists Unlock Deep Time These increases, however, were extremely unsteady and ...

We all depend on oxygen to survive, but about 3 billion years ago, there was barely any oxygen at all. When was the last time you thought about where all the oxygen on Earth came from? During this ...