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
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
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
Chris Bettinger poses for a portrait with the edible battery his team designed at Carnegie Mellon University. Stephanie Strasburg/Tribune-Review hide caption
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
This year the U.S. Forest Service is only issuing personal-use permits in Montana's national forests. Nicky Ouellet for NPR hide caption
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
A microscope image, magnified 600 times, of the bacteria that cause the sexually transmitted disease gonorrhea. BSIP/UIG via Getty Images hide caption
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 hide caption
What did she say? Eniko Kubinyi/Science hide caption
Radio telescopes of the Allen Telescope Array are seen in Hat Creek, Calif. Ben Margot/AP hide caption
What effect does background music have on shark documentaries? Dave Fleetham/Getty Images/Perspectives hide caption
Kelly Slater Wave Co Todd Glaser/Courtesy of Kelly Slater Wave Co hide caption
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 hide caption