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  1. Numbers in Mind

    Initial reports of babies' basic counting abilities have inspired a wave of new research and a spirited debate about what infants really know about numbers.

    By Bruce Bower
  2. Health & Medicine

    Chinese chimneys slash lung cancer risk

    People in rural China who replace rudimentary domestic hearths with well-ventilated stoves enjoy both less-smoky homes and a dramatic reduction in their risk of developing lung cancer.

    By Ben Harder
  3. Chemistry

    A crystal takes on an unusual topology

    A single crystal exhibits the unusual topology known as a Möbius strip.

    By Jessica Gorman

  4. 19015

    I read this article with interest. In view of your previous story noting no statistical difference in effects on bipolar disorder among lithium, valproate, and placebo (“Extended test for bipolar drug,” SN: 5/27/00, p.