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A kayaker paddles along Zephyr Cove, near the site of the 20th Annual Lake Tahoe Summit in south Lake Tahoe, Nev. President Obama said the environmental challenges of conservation and fighting climate change are inseparably linked. Rich Pedroncelli/AP hide caption

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Rich Pedroncelli/AP

Western States Face Challenges Cleaning Up After Coal Mining

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Minnesota's governor has ordered new restrictions on the use of neonicotinoid pesticides, which have been blamed for killing bees. Many details of the plan, however, remain to be worked out Jim, the Photographer/Flickr hide caption

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Jim, the Photographer/Flickr

Experimental drugs that clear clumps of proteins from the brains of Alzheimer's patients haven't panned out yet. Science Photo Library/Pasieka/Getty Images hide caption

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Science Photo Library/Pasieka/Getty Images

Test Of Experimental Alzheimer's Drug Finds Progress Against Brain Plaques

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Chris Bettinger poses for a portrait with the edible battery his team designed at Carnegie Mellon University. Stephanie Strasburg/Tribune-Review hide caption

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Stephanie Strasburg/Tribune-Review

Hurricanes Lester, Madeline and Gaston (from left to right) are seen from the International Space Station on Aug. 30. NASA Johnson YouTube/NASA composite hide caption

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NASA Johnson YouTube/NASA composite

These Central Valley sheep are happily munching on sprouted barley grown indoors. Farmer Mario Daccarett says the barley, grown in shipping containers, is sweet and keeps his sheep full longer. Ezra David Romero/Valley Public Radio hide caption

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Ezra David Romero/Valley Public Radio

With Water In Short Supply, One California Farmer Grows Feed Indoors

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This year the U.S. Forest Service is only issuing personal-use permits in Montana's national forests. Nicky Ouellet for NPR hide caption

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Nicky Ouellet for NPR

Banned From National Forest, For-Profit Mushroom Pickers Go Underground

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What did she say? Eniko Kubinyi/Science hide caption

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Eniko Kubinyi/Science

Their Masters' Voices: Dogs Understand Tone And Meaning Of Words

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What effect does background music have on shark documentaries? Dave Fleetham/Getty Images/Perspectives hide caption

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Dave Fleetham/Getty Images/Perspectives

Researchers Test The Effects Of Background Music On People

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Baby Simulator Doesn't Deter Teenage Pregnancies, Study Indicates

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Kelly Slater Wave Co Todd Glaser/Courtesy of Kelly Slater Wave Co hide caption

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Todd Glaser/Courtesy of Kelly Slater Wave Co

Surfers And Scientists Team Up To Create The 'Perfect Wave'

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