Spread of early humans: New findings

New studies reveal the diversity of early human populations and help pin down when we left Africa.

Are we in a sixth mass extinction?

This short video puts modern extinctions in context by comparing them with Earth's 5 previous mass extinctions.

New theory on why time advances

Why does time flow inexorably toward the future? A Berkeley physicist proposes that time is expanding because space is expanding.

Today in science: Michael Faraday

Meet Michael Faraday, the man behind the electric motor and theory of electromagnetism.

Satellite sees 3 California wildfires

There were more than a dozen wildfires burning in California, as of September 20.

Lifeform of the week: Rats

The secret life of urban rats.

Climate change’s role in Louisiana floods

After a rapid assessment, scientists have concluded that climate change increased chances of the August record rains in Louisiana by at least 40%.

After a year on (simulated) Mars

A week ago, a test crew emerged after living for a year in Mars-like conditions inside a solar-powered dome on the slopes of Hawaii’s Mauna Loa volcano.

Hurricane Hermine strikes Florida coast

National Weather Service in Tallahassee reported that Hermine made landfall east of St. Marks, near Tallahassee, early Friday morning as a Category 1 hurricane.

Space X explosion at Cape Canaveral

No injuries in Thursday's explosion on a SpaceX launch pad at Cape Canaveral. But Facebook's planned satellite is no more.