True Cause of Alzheimerâ??s Discovered?

In a breakthrough that will give drug developers a target for creating medicine to treat patients with dementia, researchers have for the first time identified a substance in the brain that is proven to cause memory loss.

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NASA releases the most comprehensive survey ever on global warming

With warnings that climate change "has really just started," the survey's release also signals a possible change in the Bush administrationâ??s policy.

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