The mass extinction that ended the Permian geological epoch, 252 million years ago, wiped out most animals living on Earth.

Scientists have uncovered how plants responded to catastrophic climate changes 250 million years ago. Their findings reveal the long, drawn-out process of ecosystem recovery following one of the most ...

Learn why the temnospondyls’ inability to evolve eventually did them in when mammals and dinosaurs appeared on the scene.

There are several ways to tell when a period is due. Many people experience a range of physical and emotional symptoms before their period starts, known as premenstrual syndrome (PMS), as their ...

How IUDs affect your period can depend on the type of IUD you get. Some people stop getting their period, while others may have a lighter flow. A few things about IUDs — those flexible ...

35,898 people played the daily Crossword recently. Can you solve it faster than others?35,898 people played the daily Crossword recently. Can you solve it faster than others?

Diarrhea during your period is a relatively common experience. Often called "period diarrhea," it can occur because your body releases more prostaglandins during menstruation. These chemicals cause ...

Permian Basin-focused Diamondback Energy emerged as the region’s reigning independent producer giant a year ago following its $26 billion buyout of privately-held Endeavor Energy Resources. That ...

The fossils from this period indicate a monospecific community, meaning that only a single type of organism dominated, with little evidence of biodiversity. The fossils showed a notable reduction in ...