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Also: Five people killed in shooting south of Seattle; Taliban take hostages after helicopter crashes; rescue teams work to reach earthquake victims in China; fliers brace for flight delays due to FAA furloughs.

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.

"Do you know my name?" the actress reportedly asked as an Atlanta police officer was testing her husband's sobriety beside a road. Police say that despite being warned to stay in her vehicle, Witherspoon emerged at least twice. She's charged with disorderly conduct.

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.

Animals and humans have a lot in common, including some of the health problems that plague them. In her book Zoobiquity, Dr. Barbara Natterson-Horowitz explores how studying animal illness — from cancer to sexual dysfunction — can help us better understand human health.

Children who got warts were more likely to have school classmates and relatives with warts. But going swimming, using public showers and going barefoot had little effect on whether a kid had warts or not.

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?

Canadian authorities have disrupted an alleged plot to derail a passenger train line near Toronto, the Royal Canadian Mounted Police announced Monday. The two accused, Chiheb Esseghaier and Raed Jaser, are charged with "conspiring to murder" in an act linked to a terrorist group. The authorities say the suspects are not connected to last week's attack on the Boston Marathon.

The alleged attacker, 20-year-old Dylan Quick, told authorities he "has had fantasies of stabbing people to death since he was in elementary school," according to the local sheriff's department. Fourteen people were hurt before the suspect was tackled by other students.

Brought down by a sexting scandal nearly two years ago, the former congressman is considering a run for mayor of New York City. In a long New York Times Magazine report, Weiner and his wife, Huma Abedin, talk about the scandal, their marriage and the odds against a successful comeback.