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  1. Gene influences density of the skeleton

    The mutated gene responsible for a rare bone disorder has been found.

    By John Travis
  2. Astronomy

    Age of the universe: A new determination

    Analyzing the faint glow left over from the Big Bang, scientists report measuring the age of the cosmos with unprecedented accuracy—14 billion years, accurate to within half a billion years.

    By Ron Cowen
  3. Math

    Tolstoy’s Calculus

    “Absolute continuity of motion is not comprehensible to the human mind. Laws of motion of any kind become comprehensible to man only when he examines arbitrarily selected elements of that motion; but at the same time, a large proportion of human error comes from the arbitrary division of continuous motion into discontinuous elements.”