The First Mass Extinction Event Explained: End-Ordovician
How long did the Ordovician period last, and what caused the Ordovician mass extinction to wipe out 85 percent of life on earth 445 million years ago? ...read more
Category: Discover Magazine
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Our Fascination With Aliens and When it All Started
About 75 percent of Americans believe in extraterrestrials and stories are scattered throughout history. But our attitude towards aliens has evolved in recent years. ...read more
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