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Scientists say coral reefs are among the most valuable ecosystems on earth, but we are losing them fast. More than a quarter of the world's reefs have already been destroyed. That's why Scripps scientists in La Jolla are trying to preserve them for future generations.

Atlantic writer Hanna Rosin has expanded her cover story on women's new economic dominance into a full-length book. Reviewer Annalee Newitz says it's a good snapshot of a major cultural shift — but frustratingly contradictory in its approach.

A handful of AIDS cases were first recognized in the U.S. at the beginning of the 1980s. By 1990, there was a pandemic. In 1997, more than 3 million people became newly infected with HIV. A multimedia chart lets you track the cases by country over time.

Airs Saturday, May 22, 2010 at 12:30 p.m. on KPBS TV

Ernie Lopez calls it his "rebirth." After spending nearly nine years in prison for the sexual assault of a 6-month old girl, a top Texas court threw out the conviction. And on Friday, the 41-year-old Lopez walked out of the detention center in Amarillo, Texas, where family and friends were waiting.

In an election year when candidates are trying to win the vote, some are "moving to the middle." We look at the movement and ask - is this new?

In a new policy statement, the American Academy of Pediatrics says a "ritual nick" to the genitals of newborn females might "save some girls from undergoing disfiguring and life-threatening procedures in their native countries." Law Professor Dena Davis explains the policy.

Eat 200 calories of baby carrots, and you're going to be doing a lot more chomping than if you eat 200 calories of gummy bears. Any dieter can tell you that. So can a 200-calorie photo shoot that's making the rounds on the Internet this week. But when it comes to losing or maintaining weight, a calorie is a calorie is a calorie, right?

With the anniversary of 9/11 upon us, families may be considering how best to commemorate the terrorist attacks of 11 years ago.

Researchers at Coronado Biosciences suggest ingesting worms is a good way to treat autoimmune diseases.