A protest of the Keystone XL pipeline last March along its proposed route near Bradshaw, Nebraska. NH/AP hide caption
Science
Friday
Pipefitters work on construction of the Keystone XL Pipeline's southern portion outside Tulsa, Okla., last January. PR Newswire hide caption
"People like to share, if you give them the opportunity and the choice." — John Wilbanks James Duncan Davidson/TED hide caption
John Wilbanks: Is Too Much Privacy Bad For Your Health?
A tasseled wobbegong shark (top) lies on the seafloor with the head of a brown-banded bamboo shark in its mouth on the fringing reef of Great Keppel Island on Australia's Great Barrier Reef in August 2011. Reuters/Landov hide caption
Thursday
Magellanic penguins strut their stuff on the rocky shoreline of Argentina's Punta Tombo, home to the largest colony of the birds in the world. Craig Lovell/Corbis hide caption
Changing Climate In Argentina Is Killing Penguin Chicks
Charles, Prince of Wales, smells before tasting some ice cream during a visit to Gloucestershire. Maybe he was sniffing for fat? Barry Batchelor/Getty Images hide caption
Some men take testosterone hoping to boost energy and libido, or to build strength. But at what risk? iStockphoto hide caption
An artist's concept of a narrow asteroid belt orbiting a star similar to our own sun. NASA/JPL-Caltech hide caption
Asteroid Belt May Be Just One Big Melting Pot Of Space Rocks
Gas flaring near Highway 85 southwest of Williston. Analysts estimate that almost 30 percent of the gas being produced in the state is burned off. Jeff Brady/NPR hide caption
Much Of North Dakota's Natural Gas Is Going Up In Flames
Wednesday
Playing outside can help kids — and their parents — maintain a healthy weight. iStockphoto hide caption
Adult Obesity May Have Origins Way Back In Kindergarten
Love your hair. Artists' depictions of a Neanderthal man and woman at the Neanderthal Museum in Mettmann, Germany. Martin Meissner/AP hide caption
A new study on lactose tolerance among early farmers in Spain challenges a leading theory that humans developed an appetite for milk to avoid calcium deficiency. iStock hide caption