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/ 3 February 2003
Just before it disintegrated, space shuttle Columbia experienced an abnormal rise in temperature and wind resistance that forced the craft’s automatic pilot to make rapid changes to its flight path — possible evidence that some heat-protection tiles were missing or damaged, Nasa said.
Researchers studying people who are resistant to HIV have found a group of natural proteins that seem to inhibit the progressive infection of the virus that causes Aids, a finding that could lead to new therapies.