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A group of researchers photograph a woolly mammoth tusk on the banks of the Koyukuk River in Alaska.

Baristas across the country are leading union drives at their workplaces. A combination of factors have led to this surge in activism among service workers who before now felt they had little voice.

Saudi Arabia's strategy on climate change has long been to deny the science. Saudis fear that reducing emissions will reduce oil exports and be catastrophic for their economy.

The Australian band the Go-Betweens had a limited American profile, but they were huge in Europe until co-founder Grant McLennan died in 2006 of a heart attack. McLennan's old partner, Robert Forster, has a new solo album out.

Conservation scientist Gary Nabhan says the best way to recover some of America's at-risk species is to eat them. He documents lost and threatened foods in his new book, Renewing America's Food Traditions.

Olivia Newton-John was one of the biggest pop stars in the 1970s and early 1980s. In the movie musical Grease, she starred as good girl Sandy Olson, who falls for a bad boy played by John Travolta.

For Sara Jenkins and her mother, Nancy Harmon Jenkins, food is a family affair — and a family business. Nancy, a food writer, lived in an old Tuscan farmhouse in a steep mountain valley. It was there that she first introduced her daughter, Sara, to uncomplicated cooking and fresh, flavorful ingredients.

On the eve of Mozart's 251st birthday, The Kitchen Sisters take us to Vienna, to Mozart's Hidden Kitchen: "The Tables of New Crowned Hope." The festival honored the composer's free-thinking philosophy, innovation and radical music.

Before the BP explosion in the Gulf of Mexico, the worst domestic oil spill was the 1989 Exxon Valdez in Alaska. The accident gave the oil giant a jolt and prompted the company to rethink its approach to safety. Now, Exxon does considerably better than the industry average on several safety-related measures.

English-Australian singer, songwriter and actress Olivia Newton-John has died at age 73. She was one of the the biggest pop stars in the 1970's and early 1980's.