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<strong>Cat Or Dog?</strong> Sure, you can easily tell the difference. But a machine may not be able to guess on the first try.

Deep Learning: Teaching Computers To Tell Things Apart

The first step in recognizing people could be telling the difference between a cat and a dog. Facebook is investing in artificial intelligence research, with the hopes of better sorting your photos.

A channel big enough to handle global shipping would require deep dredging throughout Lake Nicaragua, the largest source of fresh water in Central America.

Scientists Fear Ecological Disaster In Nicaragua's Planned Canal

The head of Nicaragua's Academy of Sciences says the plan for a new Central American shipping channel seems so crazy that he's having trouble persuading conservation groups to take it seriously.

What's Up With Facebook's Big Acquisition?

Facebook paid $19 billion for the instant messaging service WhatsApp even though it's never disclosed whether it's profitable. Aarti Shahani of KQED explains what Facebook sees in its new acquisition.

Hometown Hero Triumphs In Women's Figure Skating

Women figure skaters competed for the gold Thursday in Sochi. In front of the hometown crowd, underdog Adelina Sotnikova of Russia beat out South Korea's Yuna Kim.

Kiev Protesters Find Backup In Philly

As another day of clashes unfold in Kiev, Americans with Ukrainian ancestry are looking on in concern. The large Ukrainian-American community in Philadelphia is holding rallies to support protesters.

Oregon Won't Defend State's Ban On Gay Marriage

The state's attorney general said the constitutional amendment passed by voters in 2004 could not stand a federal constitutional challenge.

Letters: Winter Sports, Both Real And Fictive

Audie Cornish and Robert Siegel read emails from listeners about the rock salt shortage, the Olympic sport of curling and a proposal for a brand-new sport fit for winter: "ice walking."

A screen grab from an undercover video released by the Humane Society of the U.S. shows a pig in a gestation crate at Iron Maiden Farms in Owensboro, Ky.

'Piglet Smoothie' Fed To Sows To Prevent Disease; Activists Outraged

Undercover footage shows a hog farm feeding sows ground-up piglets that succumbed to a deadly virus. Veterinarians say it's the only method they have to protect herds against a fast-spreading disease.

President Obama very likely made Democrats' midterm campaign messaging easier by dropping from his new budget a proposal that would have reduced the size of Social Security checks.

Obama Buoys Democrats By Dropping Social Security Cut Idea

You could almost hear the sigh of relief from Democrats when the White House announced President Obama's 2015 budget wouldn't include a proposal that would have lowered Social Security benefits.

Omar (Adam Bakri) is a Palestinian baker and secret informant who braves the wall that splits his community to visit his lover, Nadia (Leem Lubany) in the Oscar-nominated film <em>Omar. </em>

One Conflict, One Wall, Two Sides Of The Arab-Israeli World

Bob Mondello reviews Omar and Bethlehem, two intriguingly similar films about the complicated relationships between Israeli secret service agents and their Palestinian informants.

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