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More than 100 years after it was originally proposed, the Smithsonian National Museum of African American History and Culture is opening its doors in Washington, D.C.

Sempra Energy is buying Texas power transmitter Oncor for $9.45 billion in cash, wresting it away from Warren Buffett's Berkshire Hathaway.

Early in the 20th century, the world had some 100,000 tigers, according to estimates. The number fell sharply over time — but the World Wildlife Fund says it has now risen for the first time in years.

The recent drought in the West forced people to take a hard look at how they use water. In Colorado, some farmers tried an experiment: make their water more expensive without hurting business.

A surge in Amazon stock made Bezos worth more than $90 billion on Thursday, putting the company's founder and CEO ahead of Microsoft founder Bill Gates. Gates, however, has given billions to charity.

Food and Drug Commissioner Scott Gottlieb says he wants to know why drugmakers churn out medicines for some rare diseases but not others.

Public health agencies are set up to regulate air pollution from cars, trucks and factories. Wildfire smoke presents a different set of threats, prompting some of those agencies to rethink priorities.

No coastal watches or warnings are in effect for Jose, but the storm is expected to bring "high surf and life-threatening rip currents along portions of the U.S. East Coast" in the coming days.

Every year, 8 million tons of plastic wash into the oceans. The biggest sources are in Asia. In the Philippines, one man is going head-to-head with multinational corporations to stop the plastic tide.

Food and Drug Commissioner Scott Gottlieb says he wants to know why drugmakers churn out medicines for some rare diseases but not others.