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People naturally sort words and objects into categories, a key process in forming memory. But when it comes to how things are mentally organized, cultures dramatically differ in their strategies.

In a paper published in Proceedings of the National Academy of Sciences, a group of researchers and scientists show that the gains that have been made in stabilizing CO2 emissions in developed or "rich" countries since the signing of the Kyoto agreement, have been neutralized by the increase in CO2 emissions from developing nations as they produce goods for trade, primarily to developed countries. Because of this disparity, many groups are calling for a change to the Kyoto agreement practice of only counting CO2 emissions that are produced in-country, rather than the CO2 footprint of those products that are consumed.

A full hour before the formal announcement of Bin-Laden's death, Keith Urbahn posted his speculation on the emergency presidential address. Little did he know that this Tweet would trigger an avalanche of reactions, Retweets and conversations that would beat mainstream media as well as the White House announcement. Keith Urbahn wasn't the first to speculate Bin Laden's death, but he was the one who gained the most trust from the network. Why did this happen?

Two NASA research aircraft will fly over the Baltimore-Washington area of northeastern Maryland through July as part of a mission to enhance the measurement of ground-level air quality from space.