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The ladies of Delta Sigma Theta celebrated the sorority's 100th anniversary over the weekend. It's one of the oldest black Greek letter groups in the country. Host Michel Martin speaks with member Paula Giddings, author of 'In Search of Sisterhood,' about the centennial.

With the right chemistry, cement can take on some of the properties of a metal, researchers report in the Proceedings of the National Academy of Sciences. Chris Benmore, a physicist at Argonne National Laboratory, explains why a semiconducting cement might be useful.

College costs the same for both genders, but women spend a higher portion of their salaries on paying off debt than men because they make less. It starts as soon as they enter the workforce.

Aquaculture in the U.S. has lagged because of opposition from environmentalists and people living on the coast. But entrepreneurs say they've found a way to produce fish on land with little pollution.

Jason Munkel introduced his father to the game a year ago, and their channel on the streaming site Twitch has grown dramatically. Twitch has also grown, and with millions watching games every month.

Emotions are still raw in Wisconsin after the bitter fight over public unions and the unsuccessful vote to recall Gov. Scott Walker. As the presidential election approaches, many people are deeply pained by the divide between political extremes, and wishing they felt better about this race.

President Obama faces political fallout after his proposal to forestall health insurance policy cancellations by allowing those with substandard plans to keep that coverage for a one-year grace period

Colorado enacted several tough gun control measures after the shooting in Newtown, Conn. — and then voters ousted two lawmakers who backed those laws. One former senator says he has no regrets, while the man who helped remove him is now focused on other gun rights supporters.

Close to 40 percent of kids in Philadelphia live in poverty — but discussion of the link between poverty and student achievement is almost absent from an ongoing debate to fix schools. Public health and education experts say poverty and hunger undermine children's development.

Robert Siegel talks to political commentators E.J. Dionne of The Washington Post and Brookings Institution and David Brooks of The New York Times. They discuss immigration and the economy.