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Nick Bain, 17, was in class one day when he calculated that only "2 1/2 to three hours" was actually useful instruction. So he decided to go out on his own to learn.

A study by the Migration Policy Institute finds that entry by unauthorized immigrants continues to decline, and about half are nabbed by U.S. authorities at least once.

The trumpeting roar of an elephant is loud. But scientists living with herds in the forests of central Africa say the deep rumbles that humans can't hear, but can feel, carry crucial messages, too.

What if there were a way to take the waste heat that spews from car tailpipes or power plant chimneys and turn it into electricity? An entrepreneur says something called thermoelectrics is the key.

When it comes to new regulations for existing coal-fired power plants, Colorado is ahead of the curve. But the state's governor and attorney general are clashing over next steps.

The demonstrators gathered after police shot and killed an 18-year-old who officers said pointed a gun at them. Police said protesters threw bottles and bricks at them. A vacant house was set on fire.

Joint exercises between the U.S. and South Korea have raised tensions in the region. Thursday's exchange was the first time the North and South had traded fire in five years.

A year ago, West Africa was reporting more than 500 new Ebola cases each week. This week, the region had just three. Could the epidemic finally be grinding to a halt?

The campus can be a laboratory of great experimentation — especially when it comes to American English.

Alexis Tsipras, fresh from a bruising battle to push a European bailout plan through parliament, will resign ahead of fresh elections set for Sept. 20.