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Stuck on a tricky math problem? Start clapping

You've probably had the feeling. Your running shoes are pounding the pavement--then suddenly your pain fades away, and you're feeling euphoric

Mars today is pretty dry.

Mars today is pretty dry. But billions of years ago, water flowed across the red planet. It ran in rivers that carved deep valleys.

James Cameron, who proclaimed himself the “king of the world” upon winning three Oscars for his 1997 film Titanic , can now proclaim himself king of the underworld as well. On Monday the moviemaker became the first solo aquanaut to reach the deepest recess of the Mariana Trench , touching down at the Challenger Deep site about 11 kilometers below the surface of the Pacific Ocean.

James Cameron, who proclaimed himself the “king of the world” upon winning three Oscars for his 1997 film Titanic , can now proclaim himself king of the underworld as well. On Monday the moviemaker became the first solo aquanaut to reach the deepest recess of the Mariana Trench , touching down at the Challenger Deep site about 11 kilometers below the surface of the Pacific Ocean.

Could stress play a role in the development of Alzheimer’s? Right now we’re not sure, but this latest study shows that it may play a role, though exactly how?

Could stress play a role in the development of Alzheimer’s? Right now we’re not sure, but this latest study shows that it may play a role, though exactly how? Well, we’re still not sure.

By Ewen Callaway of Nature magazine The Vatican has abruptly cancelled a controversial stem-cell conference that was set to be attended by the Pope next month.

By Ewen Callaway of Nature magazine The Vatican has abruptly cancelled a controversial stem-cell conference that was set to be attended by the Pope next month.

By Nina Chestney LONDON (Reuters) - The world is close to reaching tipping points that will make it irreversibly hotter, making this decade critical in efforts to contain global warming, scientists warned on Monday. Scientific estimates differ but the world's temperature looks set to rise by six degrees Celsius by 2100 if greenhouse gas emissions are allowed to rise uncontrollably. As emissions grow, scientists say the world is close to reaching thresholds beyond which the effects on the global climate will be irreversible, such as the melting of polar ice sheets and loss of rainforests

By Nina Chestney LONDON (Reuters) - The world is close to reaching tipping points that will make it irreversibly hotter, making this decade critical in efforts to contain global warming, scientists warned on Monday. Scientific estimates differ but the world's temperature looks set to rise by six degrees Celsius by 2100 if greenhouse gas emissions are allowed to rise uncontrollably. As emissions grow, scientists say the world is close to reaching thresholds beyond which the effects on the global climate will be irreversible, such as the melting of polar ice sheets and loss of rainforests

When George Zimmerman saw Trayvon Martin walking down the street in Sanford, Florida, he quickly assumed that the Black, hoodie-clad teenager was carrying a weapon. He then pulled out his gun and fatally shot the young student, whose hands were gripping nothing more than a bag of Skittles. [More]

Charles R. Knight (1874 – 1953) is best known for his arresting paintings of dinosaurs and other long-vanished beasts

In the United States, 2011 was a year when weather seemed to ping-pong between extremes. [More]