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On Monday, FBI investigators said they had not found any trace of ricin in a search of Paul Kevin Curtis' home.

Would you eat a double cheeseburger if you knew it took two hours of walking to burn it off? Participants in a new study said, hmm, maybe not. The researchers say that exercise-based labels could do a better job than calorie counts at steering people to healthful choices.

Under current laws, if a background check shows your name is on the national terror watch list, you can still purchase a gun. Government data show that people on terrorism watch lists were able to buy guns or explosives after a background check more than 1,300 times between 2004 and 2010.

Once people figured out how to roast the seeds of the Coffea plant in the 1400s, coffee took over the world. In doing so, it fueled creativity, revolutions, new business ventures, literature, music — and slavery.

There are reports that the suspects planned to head to New York City next. Also, surviving suspect Dzhokhar Tsarnaev is said to have told investigators the plot was put together only recently.

The transportation safety agency is trying to find out why the certification process for the new passenger aircraft didn't catch a critical problem with batteries.

In what sounds like a plot from The Wire, authorities say one gang has basically been running things at the Baltimore City Detention Center. The ring leader is accused of not only running his gang from the jail, but also of having sexual relations with female guards. Twenty five people face charges.

Host Michel Martin continues the conversation about how Muslims are responding to the Boston bombings and handling backlash from the events.

George W. Bush opens his presidential library this week in Dallas, where an interactive game gives visitors a taste of presidential decision-making. From one angle, Decision Points Theater is a cool learning tool. From another, it raises the question: Could an American president benefit from crowdsourcing?

A new analysis of images taken from one of the first U.S. weather satellites appears to confirm shrinking Arctic sea ice.