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(AP) -- In an unusual nod to American history, a national gardening organization will plant a tree Friday cloned from President Teddy Roosevelt's Sagamore Hill home on Long Island. It will join an ash tree cloned from George Washington's Mount Vernon estate, with plans to add genetic replica trees from properties owned by Thomas Jefferson and Abraham Lincoln - ultimately creating a tree tribute to the four presidents represented on Mount Rushmore in upcoming years.


NASA's Dawn spacecraft is on its way to study a pair of asteroids after lifting off September 27 from the Cape Canaveral Air Force Station. Mission controllers at NASA's Jet Propulsion Laboratory, Pasadena, Calif., received telemetry on schedule indicating Dawn had achieved proper orientation in space and its massive solar array was generating power from the sun.

Researchers using functional magnetic resonance imaging have found a new marker which may aid in early diagnosis of Alzheimer's disease. Alzheimer's disease is a progressive brain disorder characterized by memory loss, confusion, personality or behavioral changes and other symptoms. According to the Alzheimer's Association, more than five million Americans currently have Alzheimer's disease. While there is still no cure for the disorder, early diagnosis is crucial so that the patient receives proper treatment.