For decades, scientists have said that at least some of Earth's water came from comets and asteroids. New research suggests an even more primordial source, the vast cloud in space from which our world formed.

How natural can seawater be, in a large inland aquarium? Researchers at Georgia Aquarium in Atlanta were happy to learn that bacteria in their indoor exhibit mimicked those in the world's oceans.

If you encountered an elephant bird today, it would be hard to miss. At over 10 feet (3 meters) tall, the extinct bird is the largest known to science. But while you looked up in awe, it’s likely that the big bird wouldn't be looking back.

The ozone hole that forms in the upper atmosphere over Antarctica each September was slightly above average size in 2018, according to NOAA and NASA scientists.

This week is Diwali in India, celebrating the victory of Light over Darkness and marking the Hindu New Year. Every year at Diwali, we see this fake image circulating on social media. Sure enough, it is this year, too.

There is more to sex than male and female. For some species there are hundreds and even thousands of sexes and mating types.

A study released this past week reports that oceans absorbed 60 percent more heat than previously thought. The study estimates that for each of the past 25 years, oceans have absorbed an amount of heat energy that is 150 times the energy humans produce as electricity annually.

Strange things happen in the ocean as a result of weather and currents. These 5 events are just a few of them.

Trick or treat! Here are 3 animals that excel at playing tricks on others - and not just on Halloween!

For 20 years, researchers counting dead salmon tossed them on the side of a shallow creek. The result, it turns out, was healthier, faster-growing trees. You'll enjoy this video.