Researchers estimate over two million deaths annually from air pollution

Over two million deaths occur each year as a direct result of human-caused outdoor air pollution, a new study has found.

Warming in deep ocean may be unprecedented, scientists say

Deep ocean waters below 700 meters have heated up unexpectedly since the year 2000, according to a new analysis.

Spectacular sunset over Mono Lake

This photo was taken by Facebook friend Chris Tinker shortly after the sun set over Mono Lake, California.

Now 7.2 billion humans, and counting

The United Nations says global human population reached 7.2 billion in mid-2013. The "medium-fertility" projection for the year 2050 has been revised upward to 9.6 billion.

Airglow over Yosemite National Park

Airglow is light that originates in the high atmosphere, associated with photochemical reactions of gases caused by solar radiation. Thank you Kristal Leonard-Ferrara!

Typhoon Soulik approaching China

Typhoon Soulik is hitting parts of Taiwan today. It'll continue to push northwest and affect parts of China's provinces of Fujian and Zhejiang on Saturday.

Team cracks RNA code, finds possible new cause of autism

Many human diseases are due to defects in the RNA code. Cracking the code is crucial to creating new treatments for many conditions.

Antarctic glacier calves iceberg one-fourth size of Rhode Island

This week a European Earth-observing satellite confirmed that a large iceberg broke off of Pine Island Glacier, one of Antarctica's largest and fastest moving ice streams.

A beautiful end to a star’s life

X-rays from the Chandra X-ray Observatory (pink) shows superheated gas around the dense, hot core of an aging star.

Video: Washing your hair in space

Astronaut Karen Nyberg - currently aboard the International Space Station - demonstrates how one washes long hair in space.