Learn more about a time period marked by an intense burst of evolution. 3 min read The Cambrian period, part of the Paleozoic era, produced the most intense burst of evolution ever known.

Learn about the time period that took place 251 to 199 million years ago. 3 min read The start of the Triassic period (and the Mesozoic era) was a desolate time in Earth's history. Something—a ...

So, if you skipped a pill in your pack, or even took it at the wrong time, don’t be surprised if your period comes early. ‘Period Flu' Could Be Making You Feel Fluish 5 Reasons You Gain Weight ...