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Populations of frogs, salamanders and other amphibians are declining at an average rate of 3.7 percent each year, according to a U.S. Geological Survey study released this week.

"Those who commit sexual assaults are not only committing a crime, they threaten the trust and discipline that make our military strong," he said in his Naval Academy commencement address. Obama challenged graduates to follow "that inner compass that guides you not when the path is easy and obvious, but when it's hard and uncertain."

The plan, first announced last year, would break up the company's publishing and entertainment arms, and satisfy investors who are put off by the slow growth of its newspapers.

Last year scientists reported that a skin cancer drug appeared to reverse the effects of an Alzheimer's-like disease in mice. But four studies out this week in Science question the original results. Ronald Petersen, director of the Mayo Clinic's Alzheimer's Disease Research Center, talks about the new findings, and the hunt for Alzheimer's drugs.

A series of tornadoes struck the central United States this week, including a powerful storm in Oklahoma that killed at least 24 people. Marshall Shepherd, the president of the American Meteorological Society, describes the ingredients of major tornadoes, and how they are predicted.

Many black women in the U.S. have or know someone who has done domestic work. With an expanding black middle class, some find themselves conflicted: To hire help or not?

Billionaire Paul Tudor Jones says he's sorry for his comments at a university symposium that motherhood causes women to lose the focus needed to be good traders.

In the aftermath of the destruction in Moore, Okla., residents throughout Tornado Alley want storm shelters installed in schools. Some schools in the region already have them, but funding to build new ones is hard to come by.

With rising economic power, a new generation of Indian women is giving matchmaking a modern twist. While most Indian marriages are still arranged, single women are increasingly making their own choices, meeting potential mates via marriage-focused websites and companies that organize group outings.

The contentious little creatures were allowed in the Chelsea Flower Show for the first time in its 100-year history. Their presence has been hotly debated, but celebrity-decorated gnomes will be sold for a cause.