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Scientists are worried about the elusive members of the weasel family that live in parts of Olympic National Forest in Washington state. To see whether martens are endangered, volunteers are installing remote camera traps to take photos of the animals.

In fiction, Karen Thompson Walker's sci-fi debut and Vladimir Nabokov's unfinished final novel arrive in paperback. In softcover nonfiction, Toby Wilkinson reviews Egypt's political past; Alec Wilkinson surveys 19th-century polar exploration; and William Broad probes the science of yoga.

The boom in fossil fuels hasn't undermined the growth of renewable energy sources. Tax incentives boosted the wind and solar industries this year, but 2013 might blow for wind.

The Arizona city's gun buyback program is being challenged by the National Rifle Association. The gun rights group says it is illegal under the state's law to destroy the guns, and warned the city it will sue. Tucson officials say they are not violating the law.

Scientists who study forests say they've discovered something disturbing about the way prolonged drought affects trees. When drought dries out the soil, a tree has to suck harder to draw in water. But that increases the risk of drawing in dangerous and deadly air bubbles.

Sarah Bunting argues that with everything going on in New York City right now, the marathon is the last thing the struggling city needs — and is absolutely unnecessary as a symbol of anything at all.

Technological advances now allow Vermont's maple syrup producers to get twice as much sap per tree, meaning more syrup and more money. Statewide, the crop brought in $40 million last year, double its value from just six years ago.

The melting of ice in the northern latitudes is feeding new industries. Among them: speculating for petroleum products where vast amounts of undiscovered oil and natural gas are believed to be, and hunting for mammoth tusks unearthed in the softening tundra.

With the Supreme Court hearing arguments this week on same-sex marriage, film critic Bob Mondello observes a parallel evolution in what he calls a Hollywood mini-genre: films in which gay characters are either taken to court or seek redress in court for issues involving their sexuality.

At a mass in St. Peter's Square, the pope appealed to political leaders of the world to protect the environment, the poor and the marginalized. Representatives of the world's major religions were present, as well as some 132 delegations from all over the world.