Uncategorized

  1. Earth

    U.S. smog limit permits subtle lung damage

    Ambient concentrations of smog ozone in many regions can cause lungs to leak, potentially compromising the health of even robust people.

    By Janet Raloff
  2. Paleontology

    Fossils Hint at Who Left Africa First

    Fossil skulls found in central Asia date to 1.7 million years ago and may represent the first ancestral human species to have left Africa.

    By Bruce Bower
  3. Humans

    From the May 10, 1930, issue

    CANNON-BALL TREE The strange growth represented on the cover of this issue of the SCIENCE NEWS-LETTER is not a freak grapefruit tree. It is the normal method of flowering and fruiting of the cannon-ball tree, a member of the monkey-pot family found in the forests of South America.