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  1. Physics

    Celebrating the laser

    An introduction to the special section on lasers.

    By Tom Siegfried
  2. Health & Medicine

    Loosen Up

    Bacterial toxin may lead to less painful treatments for diabetes and brain cancer.

    By John Travis
  3. Chemistry

    Mosquito Magnets

    Your skin chemicals lure blood-sucking insects to their next meal.

    By Corinna Wu
  4. Paleontology

    Telltale Dino Heart Hints at Warm Blood

    A recently discovered fossil dinosaur heart is more like the heart of birds and mammals than that of crocodiles, providing further evidence that dinosaurs may have been warm-blooded.

    By Tina Hesman Saey
  5. Health & Medicine

    Boning up on calcium shouldn’t be sporadic

    The gains in bone health can quickly disappear when people stop taking extra calcium.