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Dog owners have similar germs growing on their skin: a signature blend of bacteria from canines' tongues and paws. Scientists couldn't find an analogous signature for cat owners. Perhaps cats are just being selfish.

Investigators have said the key clue is likely to come from photos or video taken by the public, and social media sites are buzzing with theories about possible suspects. But with so many images out there, it's like trying to find the one slightly off-white pingpong ball buried under 10,000 white pingpong balls.

If it seems perplexing why an idea that has broad support nationally could fail to pass the U.S. Senate, here's an important reminder: The Senate is not a democratic institution. In fact, it was structured to give sparsely populated states the ability to stop the majority's will. And that's what happened on background checks.

Ma said he thought of the piece as "a struggle for hope," capturing the feeling in Boston perfectly.

Lawmakers are considering a measure that would offer legal protection to groups that trap, sterilize and return feral cats to their colonies. But wildlife groups and some homeowners say the cats are a threat to public health — and to other animals.

The Barbershop guys weigh in how social and traditional media helped - and hurt - in the aftermath of the Boston Marathon bombings. They also discuss the new Jackie Robinson film '42.' Host Michel Martin hears from culture critic Jimi Izrael, freelance journalist Corey Dade, sports editor Dave Zirin, and Bostonian and healthcare consultant Neil Minkoff.

James Fallows, national correspondent for The Atlantic, talks with Host Jackie Lyden about the Boston bombings, the immigration plan and the gun debate.

A Justice Department official said the Boston Marathon bombing suspect, Dzhokhar Tsarnaev, was not read his Miranda rights before being taken into custody because of a public safety exception. Counterterrorism correspondent Dina Temple-Raston speaks with host Jacki Lyden about the history of the public safety exception and how it will be used in this case.

Texas and Oklahoma are fighting over access to the Red River. Fast-growing Texas is eager to fuel its expansion in a time of drought, while the poorer state of Oklahoma is water-rich. The court's decision could impact interstate water-sharing agreements across the country.

Amanda McGrory, 26, came in third place in the Boston Marathon women's wheelchair division. But elation gave way to sadness when the blasts went off shortly thereafter. Now McGrory is in London to compete in Sunday's marathon. She talks to Host Jacki Lyden about how it feels so race again so soon after the terror.