Day Zero approaches as Cape Town’s water runs out

Cape Town - the South African city of 3.7 million people - is on the verge of running out of water. Day Zero is the day the taps will get turned off.

What is radiocarbon dating?

At a very steady rate, unstable carbon-14 gradually decays to carbon-12. The ratio of these carbon isotopes reveals the ages of some of Earth's oldest inhabitants.

View of Winter Olympics from space

Ready for the Olympics? Here's a look at the sites of the 2018 Winter Games, the South Korean cities of Pyeongchang and Gangneung, from above.

Harvard study links breast cancer to light at night

Artificial light has transformed the night sky, a change researchers continue to link to health problems.

Humans witnessed fire-covered Earth at end of Ice Age

New research suggests that some 12,800 years ago, an astonishing 10 percent of the Earth’s land surface was consumed by fires, thanks to a cosmic impact.

Volcán de Fuego from Earth and space

Volcán de Fuego - literally "fire volcano" - is one of Central America’s most active volcanos. Photos of its recent eruption here.

Scientists solve a methane puzzle

Since 2006, levels of heat-trapping methane in Earth's atmosphere have risen sharply. A new study settles a disagreement about the source.

Is a major California earthquake overdue?

According to current forecasts, California has a 93% chance of an earthquake of magnitude 7 or greater occurring by 2045.

These clouds are called ship tracks

Ship tracks typically form among low-lying stratus and cumulus clouds. They form around exhaust particles released by ships.

Swollen Seine causing Paris floods

Eastern France experienced unusually heavy rainfall throughout January 2018, and last week the Seine, in Paris, began a precipitous rise. Videos here.