The birth rate is very low in almost every country, and unless that changes, civilization will disappear,” Musk said in an ...

This new propulsion system could rewrite the rules of spaceflight—not to mention completely defy conventional physics.

Neanderthals and Homo sapiens shared technology and customs in the Levant, shaping early human culture through cooperation.

Paradigm-shattering discovery reveals that the relationship between early humans and Neanderthals was more complex than ...

New research is reshaping how scientists understand the earliest days of Earth’s formation—suggesting that the deep interior ...

Our planet’s first known mass extinction happened about 440 million years ago. Species diversity on Earth had been increasing ...

Lauren Christensen discovered that her unborn daughter was dying in the womb. Her new memoir takes a look back.

When cynical detachment stands in the way of productive action, non-attachment offers a grieving process that can fuel ...