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President Obama banned enhanced interrogation techniques, but he's largely avoided discussing whether the tactic ever produced valuable information. He might not be able to avoid it forever: The CIA is preparing an official response to a report that concluded the techniques were worthless.

The country's top general issues a veiled reference to the former president and ex-general's house arrest.

When Scott Brown decided not to seek the Republican nomination in the state's special election to replace Sen. John Kerry, it left political observers predicting a very easy Democratic win in the blue state. Republican and Democratic experts discuss what's going on in Massachusetts.

President Obama visits Mexico this week and some of the usual issues are no longer at the top of the agenda. Host Michel Martin talks with Alfredo Corchado, Mexico bureau chief for The Dallas Morning News, who calls the trip a huge shift in U.S.-Mexico relations.

In a new book, The Anatomy of Violence, Adrian Raine argues that violent behavior has a biological basis just like depression or schizophrenia. This raises questions about treatment, accountability and punishment, including the death penalty.

A critical, unsupportive spouse isn't just a drag. That kind of mate increases the risk of major depression, researchers say. People can improve the quality of their relationships, Teo says. Interpersonal therapy and couples therapy can help identify communication problems and come up with practical improvements.

Last year, the Fermi Gamma-ray Space Telescope experienced a dangerous close pass with a Cold War-era spy satellite.

The Department of Justice's inspector general says the programs are "poorly run and lack clear standards."

Disruptions of sleep are well known as migraine triggers, but now researchers have found a genetic link between the two. In studying families with lots of migraines, they also found a mutation on a gene that helps control circadian rhythms.

Almost half of all undocumented immigrants living in the U.S. came legally — but then overstayed their visas. In an effort to curb those "overstays," the Senate is considering a bill that mandates tracking visitors' visas when they leave the country, not just when they arrive.