Scientists Think an Exploding Star Helped Kill Off the Megalodon
An Astrobiology study proposes that an ancient supernova could have exposed Megalodon and other large ocean animals to deadly muon radiation.
What the World Would Look Like If Humans Hadn't Killed All the Animals
If it weren't for the ascent of mankind, the entire world would still look like the Serengeti, a galloping, roaring, thunderous paradise.
Here's What Caused Megafauna Like the Mammoths to Go Extinct
Overhunting by humans has long been blamed for killing off the megafauna, but new research shows it might have been climate change, providing a sober history lesson about the impacts of a warming world.
Fewer people live in Nebraska these days than on Mars. In an electrified compound, the last ranchers on the Great Plains fight to stave off predators—lions, cheetahs, hyenas—imported by the wealthy.