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The president said that the promises for action that were made after the Newtown school shooting can't be "just a bunch of platitudes." He urged Americans to press Congress to pass legislation that toughens background checks for gun buyers.

Salad is not just a food; it's home to a flourishing community of mostly benign microbes. A new inventory finds surprising differences in the bacteria growing on popular fruits and vegetables.

Hundreds rallied outside the Supreme Court this week as the justices heard arguments in two gay marriage cases. Host Michel Martin speaks to Bishop Harry Jackson, who opposes same-sex marriage and spoke at the Marriage March, a rally held in Washington, D.C.

Francine Segan, author of Dolci: Italy's Sweets, discovered the unusual treat while traveling in Tuscany.

The S&P joins the Dow Jones Industrial Average, which broke its 2007 record earlier this month. Both indices have now recovered all the losses they suffered during the Great Recession.

President Obama commented on the long lines for some voters during his re-election acceptance speech last November. And at his State of the Union address, he promised to seek solutions. The new commission will make recommendations to states, but it will not have the power to enforce any changes.

Fly from Angola down to South Africa and you'll see thousands of circles of bare dirt covering the land. They're up to 30 feet across and ringed by tufts of grass. The origin of the shapes has long been a mystery, but researchers now say hordes of termites may be acting as engineers.

The sand is pumped underground along with water and other chemicals to extract oil and natural gas trapped deep in rock. But researchers found that air samples taken at some drilling sites contained high enough levels of very fine silica particles to be dangerous to workers.

A lawyer representing "Sister Wives" said the march of the law is toward the "right to be left alone." He said polygamy is now where gay marriage was a decade ago.

Dawn Maestas helps women who have been branded with tattoos as a result of domestic violence.