Even though there are 8 billion people on Earth today, a catastrophe could send that number much lower within a few decades.

To answer these questions, it is easiest to start with the amount of gold that humans have mined to date. The U.S. Geological ...

Subduction zones, where one tectonic plate dives underneath another, drive the world's most devastating earthquakes and ...

These large, flightless birds have powerful, muscular legs and tough, prehistoric-looking feet with claws that can deliver a ...

As a result, purple and magenta are known as "nonspectral" colors, because they don't really exist as actual electromagnetic ...

A pair of canines found in Siberian permafrost were wolf sisters that died shortly after eating.

Earth's magnetic field and oxygen levels have increased more or less in parallel over the past 540 million years, suggesting ...

Researchers armed with the Hubble Space Telescope have revealed that some of Uranus' largest moons have one side brighter ...

Breathing patterns among humans are so unique that they can work as an identification tool, scientists report. They propose ...

Low iron levels can flip the genetic switch on a mouse's sex during development, causing XY embryos to grow female features.

The Zanj, enslaved people largely from Africa, rebelled at the same time they were ordered to build a massive system of ...

NASA's Chandra X-ray Observatory has captured a striking image of a distant quasar from the "cosmic noon," including a giant ...