Study finds older people who speak more than one language build up a cognitive reserve from a lifetime of enhanced mental activity
Discovery could help map galaxy
Astronomer says comets also may be key to life elsewhere in universe
Faint remnants of the exploded star offer new clues to the formation of the early universe
British astrophysicist pioneers efforts to unlock secrets of the cosmos
'Science' magazine compiles list of year's top achievements in science and technology
Warmer world threatens nation’s biodiversity
More extreme weather predicted as planet warms
By 2014, non-profit group hopes to get one billion people to chant for environmental reform
UN talks hinge on $100 billion climate fund
Leaders discuss extending 1997 Kyoto agreement
International study ends a 20-year dispute over how much ice is being lost or gained in Greenland and Antarctica
Delegates from 200 nations to discuss how to limit greenhouse gas emissions, extending Kyoto protocol
One in six Americans is chronically hungry while US discards $165 billion worth of food each year
Webcast features noted climate scientists, public officials, business leaders, activists and celebrities
Reduced winter snowpack could mean less drinking water in the future
Putting a value on waste, they're turning it into a marketable resource.
New reference material will sharpen timelines of human, climate history
Without insect pressures, plants' natural defenses decline
NASA scientists say football-sized rock has some surprisingly Earth-like qualities
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![The midnight sun casts a golden glow on an iceberg and its reflection in Disko Bay, Greenland. Much of Greenland’s annual mass loss occurs through calving of icebergs such as this.[Image courtesy of Ian Joughin]](https://gdb.voanews.com/2ed42d5e-8974-4644-bdbe-c2a9c718c028_w100_r1.jpg)
![The midnight sun casts a golden glow on an iceberg and its reflection in Disko Bay, Greenland. Much of Greenland’s annual mass loss occurs through calving of icebergs such as this.[Image courtesy of Ian Joughin]](https://gdb.voanews.com/2ed42d5e-8974-4644-bdbe-c2a9c718c028_w66_r1.jpg)
