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NPR's Tom Goldman joins guest host Susan Stamberg to talk about his impressions of the London 2012 Olympics so far and what's in store for next week.

Former Pennsylvania Sen. Rick Santorum is looking for momentum as Republicans caucus and vote in three states on Tuesday: Missouri, Minnesota and Colorado. And dissatisfaction with front-runner Mitt Romney in Missouri could point to a potential opportunity for President Obama in the fall.

Since Trump secured the GOP nomination, he has done little to quell concerns of many Republicans. Maryland's and Ohio's GOP governors are now among those refusing to endorse him.

For Pascal Baudar, LA is a treasure trove of edible plants and insects that he uses in unusual culinary creations. He helps some of the city's top chefs put wild foods on menus and has a new cookbook.

Levison Wood, who previously walked the length of the Nile River, has now trekked 1,700 miles, from Afghanistan to Bhutan, along the Himalayan mountain range.

Long before cooking was common, early humans needed extra energy to fuel bigger bodies and brains. Scientists say simple stone cutting tools likely allowed small-toothed meat eaters to thrive.

Whatever Congress might come up with would certainly be controversial — and this is an election year. That hasn't stopped some lawmakers from taking sides in the privacy vs. national security debate.

California regulators say autonomous cars should have a licensed driver, but a top Google engineer says that makes as much sense as putting a steering wheel or brake pedal in the back of a cab.

Millions of people want caffeine removed from their coffee. Millions more want caffeine added to their soda. Little-known caffeine factories, scattered across the world, satisfy both desires.

Israel is the top recipient, by a wide margin, of U.S. foreign military aid. As the current 10-year aid package nears its end, U.S. and Israeli officials are negotiating a new and likely even bigger aid deal. Senators from both parties are prodding the White House to get a "robust" deal done; many have arms industries that will benefit. Critics call it a give away to a prosperous nation that drains spending on the home front.