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  1. Earth

    Study gives new answer for muddy mystery

    Geologists provide evidence that quartz silt in ancient seabeds doesn't come from eroded land rocks, but rather from the dissolved skeletons of tiny primitive creatures, possibly altering the fossil record and changing models of prehistoric climate and ocean geography.

    By Ruth Bennett

  2. Strep infection sets off tics in some kids

    Some children may have a genetic susceptibility to developing obsessive-compulsive disorder and tic ailments after a streptococcal infection.

    By Bruce Bower
  3. Humans

    From the June 17, 1933, issue

    STRATOSPHERE SHELL PREPARED FOR NAVIGATORS The little metal sphere that will be the stratosphere home of two men and scientific instruments for a few hours next month is rapidly being completed (SNL, May 27, ’33, p.