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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
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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
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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
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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
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Hurricanes Lester, Madeline and Gaston (from left to right) are seen from the International Space Station on Aug. 30.
NASA Johnson YouTube/NASA composite
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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
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A boy is crowded among more than 700 migrants on a wooden boat before being rescued about 13 miles north of Sabratha, Libya. The boat was one of 40 vessels rescued on Monday.
Emilio Morenatti/AP
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Bacteriophages, in red, look like tiny aliens, with big heads and skinny bodies. They use their "legs" to stick to and infect a bacterial cell, in blue.
Biophoto Associates/Science Source
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