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Ken Caldeira is trying to come up with a big solution to the problem of increasingly acid oceans: antacids for coral reefs. That might keep the reefs from being destroyed by humans' use of fossil fuels. And that's not his only big idea. But even Caldeira admits that his audacious plan could fail.

The remains of four more first responders were identified, according to authorities. Most of the 14 people who died were reportedly volunteer firefighters and EMS personnel.

The Kentucky senator says he's "considering" a 2016 run for the White House. Backers tout the built-in support and money networks established during 2008 and 2012 presidential runs by his father, former Texas Rep. Ron Paul. But others view the dad's libertarian legacy as a decidedly mixed bag.

The two suspects in the Boston Marathon bombing were ethnically Chechen. The central Asian region of Chechnya has a troubled history. It has also seen some of that region's most notorious terrorist incidents in recent memory. Host Michel Martin learns more from Alexey Malashenko of the Carnegie Endowment for International Peace.

Impact from the furloughs has been neither extreme nor widespread, with busy airports in Chicago, Atlanta, and Los Angeles reporting no or few delays as of early Monday afternoon. New York's three big airports experienced delays, but the longest holdups were blamed on high winds and maintenance work.

Joseph Kosinski's sci-fi adventure, starring Tom Cruise, is the most incoherent piece of storytelling since John Travolta's Battlefield Earth. It had critic David Edelstein crying, "What? What?" over the din of the explosions.

Brazil's largest city is more about business than art. But a new crop of creators — who work in media as different as crochet, graffiti and poetry — is trying to change that by sprucing up public spaces.

A.J. Clemente's career at KFYR was over before it started. It leads us to ask: What's your best — in a bad, or good way — first-day story?

Investigators in the Boston Marathon bombings were able to identify the suspects using footage from surveillance cameras. Some believe that this shows the need for surveillance cameras in public spaces, while others believe that such cameras encroach on our civil liberties.

A new strain of bird flu has sickened 82 people and killed 18 in China. But many people who have caught the H7N9 flu say they hadn't been near poultry or other birds. So what's fueling the outbreak of the virus?