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Plants have been using a green pigment for billions of years to capture sunlight, turning it into a flow of electrons and storing its energy in the chemical bonds of big organic molecules (also known as food). Given that successful history, chemist Michael Graetzel of the Swiss Federal Institute of Technology in Lausanne and his colleagues turned to a compound similar in shape and color to chlorophyll when they set out to build a better solar cell.

They say what doesn’t kill you makes you stronger. But sometimes what makes you stronger can kill you, at least when it comes to blood-clotting

Climate change and expanding seas could cause the waters beneath the Golden Gate Bridge to rise 3 to 4 feet by century's end, a new study finds. [More]

(Updates toll, adds color) MUSCAT, Nov 3 (Reuters) - The death toll from a tropical [More]

As NASA prepares to launch its new Curiosity Mars rover, we look back at some of the highlights--and the misfires--in more than 50 years of Mars missions [More]

Key concepts Chemistry [More]

I originally published this on November 2, 2008 . You really need to reed the comments there, at the original post, as well as the “related” posts at the bottom of this post, as this story had some legs – a lot of discussion ensued. [More]

CANNES, France (Reuters) - Mexican President Felipe Calderon urged Washington and Beijing on Thursday to agree to curb the release of climate-warming gases to ensure the success of United Nations climate talks in South Africa later this month.

By Jeff Jones and Andrew Quinn CALGARY/WASHINGTON (Reuters) - The decision on the controversial Canada-to-Texas Keystone pipeline could slip into next year, a U.S.

People with an uncommon form of cystic fibrosis started gaining weight and were better able to breathe than their untreated counterparts after just two weeks on an experimental drug, according to a study published November 2 in The New England Journal of Medicine . If approved by the U.S.

SHANGHAI -- After decades of getting its millions of citizens off their bicycles and into modern transportation, China is now struggling to make a big policy U-turn. [More]

This chart shows the shift in the U.N. development index for Norway (top purple), the U.S. (second purple), Turkey (green) and the Democratic Republic of the Congo (red) from 1990 to 2011 If global development were a horse race, would you put your money on the slow-and-steady contenders or a fast new contender

“So often patients aren’t satisfied with the communication they have with their doctor. And yet I know that physicians care so much about their patients.” James Tulsky, director of the Duke Center for Palliative Care

By Ewen Callaway of Nature magazine Woolly mammoths, woolly rhinos and other large animals driven to extinction since the last ice age each succumbed to a different lethal mix of circumstances.

By Virginia Gewin of Nature magazine Nicotine causes changes in gene regulation that enhance the brain's subsequent response to cocaine. [More]