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  1. Math

    A Remarkable Dearth of Primes

    The pursuit of prime numbers–integers evenly divisible only by themselves and 1–can lead to all sorts of curious results and unexpected patterns. In some instances, you may even encounter a mysterious absence of primes. In 1960, Polish mathematician Waclaw Sierpinski (1882–1969) proved that there are infinitely many odd integers k such that k times 2n […]

    By Ivars Peterson

  2. Ragweed may boom with global warming

    An experiment that includes artificially heating plots of tallgrass prairie suggests that global warming could boost growth of ragweed, putting more pollen into the air for allergy sufferers.

    By Susan Milius

  3. Speech veers left in babies’ brains

    The beginnings of left-brain specialization for speech understanding appear in 2-to-3-month-old babies as they listen to an adult talk, according to a new brain-scan investigation.