2

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

itoggle caption Chip Somodevilla/Getty Images
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Cannons Youth Lagoon 0:14

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    Youth Lagoon
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    Cannons
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    Year of Hibernation
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    Fat Possum

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Posters Youth Lagoon 1:30

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    Year of Hibernation
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3

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

itoggle caption Narinder Nanu/AFP/Getty Images
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Mere Ghar Aayi Ek Mukesh 0:30

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    Mukesh
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    Mere Ghar Aayi Ek
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    Kabhi Kabhie
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T = 0 Ranjit Barot 0:30

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Pavana David Russell 0:10

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Pavana David Russell 0:30

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Bluegrass Stomp David Grisman 0:32

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    Happy Birthday Bill Monroe--Dawg Plays Big Mon

Kentucky Waltz David Grisman 1:29

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    Happy Birthday Bill Monroe--Dawg Plays Big Mon

Holiday Commercial Alan Hawkshaw 0:35

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    Music for TV Dinners: The 60's
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Tobacco Auctioneer Raymond Scott 0:55

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    The Music of Raymond Scott: Reckless Nights & Turkish Twilights
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Sneakers Eakle, Matt Band 0:12

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    Hardly Work

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On the Sunny Side of the Street Dave Brubeck Quartet 1:30

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    Park Avenue South
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Inside Job The Nice Guy Trio 0:03

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    Sidewalks and Alleys/Waking Music

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Caught in Thought The Nice Guy Trio 0:31

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15

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

itoggle caption Robin Lubbock/WBUR
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18 Ghosts II Nine Inch Nails 0:19

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    Ghosts I-IV
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18 Ghosts II Nine Inch Nails 0:30

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    Ghosts I-IV
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17

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

itoggle caption Rick Bowmer/AP
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Christo Redemptor Charlie Musselwhite 0:05

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    Charlie Musselwhite
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    Legends of Harmonica
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Lover, Come Back to Me Larry Adler & Django Reinhardt 1:40

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    Larry Adler & Django Reinhardt
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    Lover, Come Back to Me
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    Legends of Harmonica
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Bein' Green Andrew Bird 0:11

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    Bein' Green
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    Muppets: The Green Album
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Muppet Show (Theme From "The Muppets") ProSource Studio Musicians 0:55

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    Karaoke - Muppet Show (Theme From "The Muppets")