Former U.S. Sen. Rick Santorum greets voters this summer in Iowa. The Republican presidential hopeful has spent most of his professional life in politics. Chip Somodevilla/Getty Images hide caption

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Santorum: Early Political Work Influences Him Still

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Cannons Youth Lagoon
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Year of Hibernation
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Posters Youth Lagoon
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Year of Hibernation
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Sikh pilgrims stream into the Golden Temple in Amritsar, India, on Nov. 10. Devout Sikhs from all over India and the world come to Amritsar by the tens of thousands every day — adding to an already sizable carbon footprint. So city and temple officials have joined an environmental group to learn how to incorporate environmentally friendly practices. Narinder Nanu/AFP/Getty Images hide caption

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In India, Spreading A Green Gospel Among Pilgrims

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Mere Ghar Aayi Ek Mukesh
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Kabhi Kabhie
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T = 0 Ranjit Barot
Pavana David Russell
Pavana David Russell

The scarcity of ADHD medications is a problem faced by an untold number of children and adults with the disorder. GoodMood Enterprises/iStockphoto hide caption

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Shortage Of ADHD Drugs Has Parents, Doctors Scrambling

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Bluegrass Stomp David Grisman
Kentucky Waltz David Grisman
Holiday Commercial Alan Hawkshaw
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Tobacco Auctioneer Raymond Scott
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Sneakers Eakle, Matt Band
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On the Sunny Side of the Street Dave Brubeck Quartet
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Inside Job The Nice Guy Trio
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Caught in Thought The Nice Guy Trio
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Nathan Phillips looks at methane data plotted on a map of Boston streets on Nov. 17. Data from a mobile methane "sniffer" and a GPS show a real-time display of the gas levels in Google Earth. The orange spike in the center of the screen, on St. Paul Street, indicates methane levels about two or three times above normal levels, Phillips says. Robin Lubbock/WBUR hide caption

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Boston's Leaky Gas Lines May Be Tough On The Trees

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18 Ghosts II Nine Inch Nails
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18 Ghosts II Nine Inch Nails
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A Nissan Leaf charges at a station in Portland, Ore., that can recharge an electric car in 30 minutes. Electric cars could be an integral part of meeting 55-mpg fuel standards by 2025, but many consumers are put off by the vehicles' higher price and what some call "range anxiety." Rick Bowmer/AP hide caption

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Can Electric Cars Help Automakers Reach 55 MPG?

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Christo Redemptor Charlie Musselwhite
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Lover, Come Back to Me Larry Adler & Django Reinhardt
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Anchorphibian: Kermit the Frog does the backstage-chat thing with Amy Adams and Jason Segel in The Muppets. Scott Garfield/Disney hide caption

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For Muppeteers, It Isn't Easy Being Invisible

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Bein' Green Andrew Bird
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Muppet Show (Theme From "The Muppets") ProSource Studio Musicians