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After an elementary school shooting in Connecticut, Americans continue to struggle to understand why it happened and how to prevent future tragedies. Host Michel Martin discusses the shooting with author Paul Barrett, journalist Craig Whitney and psychiatrist Carl Bell. They talk about the politics and psychology of America's gun culture.

Journalist Rob Cox grew up in Newtown, Conn. and moved back after many years abroad. Cox, editor for Thompson Reuters global commentary service Breakingviews, talks about how the mass shooting at Sandy Hook Elementary School has transformed his hometown.

Secretions from a brown frog's skin contain chemicals that might be useful in fighting bacteria. Russian researchers are cataloging compounds in the slimy goo. Although the odds against them are long, the researchers hope their work will aid the search for new drugs.

The stage appears to be set for a renewed debate about gun control. The NRA and other proponents of gun owners' rights have been silent in the aftermath of the Newtown shootings, but many will question the benefits of possible restrictions.

Are we getting "Jack'd"? A surge in new caffeine-containing foods leads to new questions about just how much caffeine we're getting in our daily lives. Some advocates are calling for labeling, and they raise concerns about children's and teens' consumption.

In recent years, states have passed a patchwork of immigration laws, at times running afoul of the U.S. Constitution. Advocates for the tough measures say state and local governments should still have a role, even as the debate shifts to the federal level.

Hawaii Sen. Daniel Inouye died Monday at the age of 88. His cause of death was respiratory complications. Inouye had served in the U.S. Senate since 1962. Melissa Block talks to Ron Elving about his life and political career.

Park Geun-hye's father was a military dictator who ran the country for nearly two decades. She has apologized for her father's suppression of democracy and appears to be slightly favored in Wednesday's presidential vote.

The population explosion in Williston, N.D., has been a blessing and a curse for many local businesses. Stores and restaurants are struggling to find workers because they can't compete with what most oil jobs pay. Plus, there's now a day care shortage, and housing costs have skyrocketed.

On Tuesday, the National Institutes of Health in Maryland is holding a second day of talks about whether and how to continue funding some controversial scientific experiments. Back in January, virologists agreed to temporarily stop research that was creating new forms of bird flu, because critics argued that the work was too dangerous.