Carl Sagan first detected such flashes in 1993, and now scientists have finally solved the mystery.
For the first time ever, there's video footage of narwhals using their long tusks in a hunt.
Another idyllic paradise ruined by pollution.
Hate flying? In this airport, you'll be comforted by miniature horses.
Another mysterious monstrosity has turned up dead.
Life could be ferried across the universe in the form of this pretty purple flowers.
Space dirt and rocks could be the next great commodity.
The massive expanse of dryland forests stretches about 467 million hectares.
In a strange twist, killer whales begin targeting sharks for their livers and hearts.
Water and water vapor in the primitive atmosphere could reveal a lot about the formation and development of planets.
Gigantic landforms as big as the Eiffel Tower are scratching the ice from underneath Antarctica.
Women aren't allowed to step foot on the island, while ancient rituals are required on the men who do.
The first funerary garden ever found speaks a lot about the ancient world.
Patients of the state's first mental institute were found buried under the campus.