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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.

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.

Charles R.

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]

Water, water, everywhere. But will we always have enough to drink? Wash away our waste?

Water, water, everywhere.

Dressings for your dish. | Photo by Michael Rosenstein, CC. Click on image for license and information.

Dressings for your dish. | Photo by Michael Rosenstein, CC.

You may not know his name, but chances are that you have seen his work. Brooklyn-born artist Charles R.

You may not know his name, but chances are that you have seen his work.