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As the United States formulates its response to North Korea's missile tests, Robert Siegel talks with Ashton Carter, Professor of Science and International Affairs at Harvard University. Carter recently argued that an op-ed arguing that the United States should preempt a strike.

The Kansas Board of Education again has adopted science standards that take aim at evolution. Supporters say it's about bringing academic integrity to the science classroom. Critics call it an attempt to inject religion into science education.

Last week's terror attacks in Mumbai, India have humiliated the Indian government. They've escalated tension between India and Pakistan and they've put new fear in people throughout the world. Dipak G

Three different space probes have gathered evidence that the top layer of the moon's surface contains hidden stores of water. The moon is generally thought to be a dry place, and the discovery comes as an unexpected — and exciting — surprise for researchers.

BP engineers are using the saw to slice through a pipe to fit a cap over the blown-out well. Officials acknowledge that the "cut and cap" procedure could end up sending more oil into the Gulf of Mexico. Meanwhile, the oil slick drifted perilously close to the Florida Panhandle.

It's been more than 10 years since scientists first showed it is possible to grow embryonic stem cells. Despite political wrangling over the years, scientists have made advances in basic research. Still, there is a ways to go before stem cells can be used to treat disease.

Mexican authorities continue to find bodies in mass graves near the town of San Fernando by the U.S.-Mexico border. While violence along the San Diego-Tijuana region seems to be decreasing, we'll talk about why the story hits close to home.

The EPA announces new air-pollution standards for particulate matter. The standard affects what pollution controls power plants and other big industries are required to install. The agency says the change will save billions in health-care costs.

Some say they hold the potential for medical miracles. Others claim they are a moral abomination. Either way, human embryonic stem cells captured headlines during the past decade in a way few areas of scientific research have before.

Opening statements begin Thursday in the trial of Baltimore Mayor Sheila Dixon, the first African-American woman to lead the city. Prosecutors say Dixon asked wealthy developers to donate gift cards to the poor in Baltimore, and then used those cards for personal shopping sprees.