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Historians have speculated for years that global environmental changes caused some ancient wars to erupt, or even societies to collapse. Such connections may still exist--because new research finds that the risk of civil war in tropical countries increases during hot, dry El Nino years as opposed to cooler La Nina periods. The study is in the journal Nature .

By Timothy Gardner and Ayesha Rascoe WASHINGTON (Reuters) - A proposed $7 billion Canada-to-Texas pipeline cleared a major obstacle on Friday with the release of U.S.

* Hurricane to land at N. Carolina Saturday, rake up coast * Tens of thousands of coastal dwellers start to evacuate [More]

* Hurricane to land at N. Carolina Saturday, rake up coast * Tens of thousands of coastal dwellers start to evacuate [More]

X-rays can help reveal anything from bombs hidden in luggage to tumors in breasts, but some potentially vital clues might be too faint to capture with conventional methods. Now a new x-ray technique adapted from atom smashers could resolve more key details. Conventional x-ray imaging works much like traditional photography, relying on the light--in this case, x-rays--that a target absorbs, transmits and scatters.

By Shinichi Saoshiro TOKYO (Reuters) - Japan aims to halve radiation over two years in places contaminated by the Fukushima nuclear crisis, removing soil, plants and trees as well as cleaning roofs of buildings in an area spanning thousands of square kilometers. [More]

Everyone likes to talk about the weather, and maybe someone could do something about it someday. [More]

By Neil Hartnell NASSAU (Reuters) - The northeast seaboard, including Washington and financial center New York, rushed to prepare on Thursday for a possible mauling from Hurricane Irene that will hit the U.S. coast this weekend. [More]

By Yereth Rosen ANCHORAGE, Alaska (Reuters) - Federal authorities are investigating the fatal shooting of a polar bear at an Alaska oil field operated by BP, the U.S. Fish and Wildlife Service and the oil company said on Thursday

It doesn’t take much imagination to think of ways in which all of the data being recorded into electronic health records (EHRs) could be used study diseases and map trends. [More]

Apple has been on a decade-long roll starting with the its game-changing MP3 music player--the iPod-- in November 2001 right through its monumental, if brief, climb earlier this month to become the most valuable U.S. [More]

It’s not that the central and northern portions of the east coast of North America never see hurricanes. [More]

Say you need a diamond. You could go down to the jeweler, or you could put some carbon deep underground and let it sit for a couple billion years

From Nature magazine It sounds like a conspiracy theory: 'cosmic rays' from deep space might be creating clouds in Earth's atmosphere and changing the climate. Yet an experiment at CERN, Europe's high-energy physics laboratory near Geneva, Switzerland, is finding tentative evidence for just that

Germany will become the first country completely accessible to fuel cell vehicles in 2015, when carmaker Daimler and the Linde technology group will build 20 new hydrogen filling stations. The result will quadruple the number of public stations available and make it possible for a fuel cell vehicle to reach any location in the country