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Mouse natural killer cells in the spleen of an animal infected with a virus.
By Mehrdad Matloubian and Karoline Hosiawa-Meagher, University of California San Francisco
In the rough-and-tumble world of your immune system, cells don't come any tougher than the "natural...more

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The Nature Conservancy/AP
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Decision to eradicate feral cats from Macquarie island to save seabirds allowed the rabbit population to explode and, in turn, destroy much...
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File photo, NASA/Reuters
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When galaxies initially formed, they weren't the first in the cosmic neighborhood. The supermassive black holes, which reside at the center...
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President Bush will establish the largest marine reserve ever created today when he designates three remote Pacific Ocean regions as...
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AP
Take that, Andromeda! For decades, astronomers thought when it came to the major galaxies in Earth's cosmic neighborhood, our Milky Way was...