Why birds sing in the spring

Day length, sunlight and instinct give the birds their seasonal cue

Army identifies soldier killing in Alaska bear attack

The U.S. Army has identified a soldier who died of injuries sustained in a bear attack in Alaska.

Huge black hole at galaxy's center seen in first-ever images

Using telescopes worldwide, astronomers have captured the first image of the supermassive black hole at the center of the Milky Way.

2 sperm whales die within one week in Florida Keys

A sperm whale calf died after beaching itself in the northern Florida Keys last week. Six days later, an emaciated adult whale was found beached near Key West. A necropsy determined the calf likely died after becoming separated from its mother.

Cleaner air leads to more hurricanes in the Atlantic, study finds

A new study links how many hurricanes form worldwide to air pollution levels. Wednesday's study from the National Oceanic and Atmospheric Administration says cleaner air in Europe and the United States is helping trigger a dramatic increase in the number of Atlantic hurricanes.

'Most intense' solar flare captured on stunning imagery

On Tuesday, a strong solar flare erupted from the sun, sending energy across the galaxy, which made for spectacular imagery of the invisible light.

Tonga volcanic eruption forced hurricane-speed winds to space

When the Hunga-Tonga-Hunga-Ha'apai volcano erupted, it caused pressure disturbances that led to winds of up to 450 mph to reach space.

Sun will not set until August in northern Alaska

The sun rose over Utqiaġvik, Alaska, at 2:58 a.m. AKDT on Tuesday and will not set again until August 2.

'One-in-a-million' yellow cardinal spotted in Florida

Experts say while there are millions of red cardinals, there are only 10-15 yellow cardinals in North America.