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Yeast affects several aspects of beer including the foam, or head, that forms on the of the glass. If fermentation is too vigorous, too many of the foam-stabilizing proteins may be lost.

When The Microbes Are Happy, The Brewer Is Happy

Yeast are demanding little critters. To make good-tasting beer, brewers have to pamper them like pedigreed pets. A new report says it's all about the microbiology. Brewers say they use science to keep their charges happy.

As The Blizzard Hits, Here's Coverage From Local NPR Member Stations

NPR member stations and reporters in the path of the storm will offer their updates on what they see in their region.

A man counts yuan to fill red envelopes in Beijing. Many families celebrate the Lunar New Year by exchanging small envelopes filled with money.

Show Me The Money In Your Lunar New Year Envelope

Envelopes filled with money are traditionally given to children for the Lunar New Year in Chinese, Korean, Vietnamese and other Asian immigrant families. The married adults who usually give them out face a perennial question: How much money should I give?

Historic Blizzard Freezes Transit In Northeast U.S.

The blizzard that is battering the Northeast has disrupted transit throughout the region and beyond. Thousands of flights have been canceled. Amtrak and commuter trains have stopped running in many places, and people are trying to find a safe place to wait out the storm.

President Obama greets law enforcement officers after speaking on ideas to reduce gun violence at the Minneapolis Police Department Special Operations on Monday.

For Some In Minneapolis, National Gun Debate Hits Close To Home

Earlier this week, President Obama was in Minneapolis advocating new limits on guns; no law or set of laws, he said, can keep children completely safe. NPR's David Welna sent this reporter's notebook about what he heard from some of those engaged in the gun debate in his home state.

A Syrian rebel prays on a street in the northern city of Aleppo in January. Many Syrians are debating what role Islam should play in Syria if the current secular government is toppled.

Will Syria Become An Islamist State?

Syria has generally followed the "middle way" in Islam, but ultra-conservative Islamists have been on the rise throughout the region. Syrians are debating what role Islam might play if President Bashar Assad's regime is toppled.

Muslims pray during a special Eid ul-Fitr morning prayer at the Los Angeles Convention Center on Aug. 30, 2011, in Los Angeles.

As Islam Grows, U.S. Imams In Short Supply

The more than 2,100 American mosques are facing a challenge. There aren't enough imams, or spiritual leaders, to go around.

Don't let the name fool you. The kissing bug, or <em>Rhodnius</em> <em>prolixus,</em><em> </em>transmits the Chagas parasite when it bites someone's face.

Obscure Chagas' Disease Takes Costly Toll

Chagas' disease, which is transmitted by the "kissing bug," occurs mainly in Latin America. But the illness is on the rise in the U.S. Health economists now estimate that Chagas costs the world about $7 billion annually, which is more than the cost of cervical cancer or cholera.

Mumford & Sons (from left: Ben Lovett, Marcus Mumford, Ted Dwane and Winston Marshall) accept the award for album of the year at the Grammy Awards on Sunday night.

Mumford & Sons Take Home Album Of The Year Grammy

Call it diversity or a lack of consensus, but no single act dominated this year's awards. Instead, the Grammys spread the love, though rock bands — including The Black Keys and fun. — fared well.

Auntie Anne's Pretzels In Beijing: Why The Chinese Didn't Bite

It's the entrepreneurs' dream: tapping into China's market of 1.3 billion people. That dream fueled the efforts of two Chinese-American MBAs to take the soft-pretzel franchise — a staple of U.S. shopping malls — to China. Cultural and financial barriers, however, led to a far more challenging reality.

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