Phoenix Mars Lander - NASA's latest robot has already found frozen water and is looking for more signs that the Red Planet could support life.
Brain Trauma - Even so-called "mild" head injuries turn out to be anything but.
Mammoth Mystery - A pair of mammoth skeletons is found locked together by their tusks. What happened?
Profile: Judah Folkman - Once scorned for his ideas about how cancer grows, the late Judah Folkman is now hailed as a visionary.
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