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  1. Paleontology

    Fossil leaves yield extinction clues

    Analyses of fossil leaves provide more evidence that the mass extinctions that wiped out the dinosaurs 65 million years ago were sudden and probably brought about by an extraterrestrial impact.

    By Sid Perkins
  2. Health & Medicine

    Dynamite discovery on nitroglycerin

    Scientists have found a long-sought enzyme that may be behind nitroglycerin's dilation of blood vessels.

    By John Travis
  3. Health & Medicine

    Ginseng extract halts diabetes in mice

    Extracts from the berry of the American ginseng plant counter obesity and insulin resistance in mice.

    By Nathan Seppa
  4. Earth

    Tomato compound repels mosquitos

    New insect repellents based on a compound that contributes to the smell of crushed tomato leaves are under development.