Vol. 162 No. #17
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More Stories from the October 26, 2002 issue

  1. Astronomy

    News flash: Earth still has only one moon

    An object discovered orbiting Earth in early September isn't a moon but something much more mundane—an upper stage of a rocket that was used in the Apollo 12 mission to the moon.

  2. Chemistry

    Dipping deeper into acid

    New experiments reveal how a molecule of acid dissolves in water.

  3. Paleontology

    Stegosaur tails packed a punch

    A mathematical analysis of a fossil stegosaur's bones leaves little doubt that the creature's spike-studded tail was an effective defense against predators.

  4. Paleontology

    Mosasaurs were born at sea, not in safe harbors

    Newly discovered fossils of prehistoric aquatic reptiles known as mosasaurs suggest that the creatures gave birth in midocean rather than in near-shore sanctuaries as previously suspected.

  5. Paleontology

    Curved claws hint at pterosaur habits

    A study of the claws of flying reptiles known as pterosaurs suggests that some of the creatures may have walked like present-day herons and used their wing fingers to hold prey.

  6. Paleontology

    Trackway site shows dinosaur on the go

    Scientists say that a sediment-filled, bathtub-shape depression found at one of North America's most significant dinosaur trackway sites is the first recognized evidence of urination in dinosaurs.

  7. Ecosystems

    Insects, pollen, seeds travel wildlife corridors

    Strips of habitat boost insect movement, plant pollination, and seed dispersal among patches of the same ecosystem.

  8. Physics

    Neptunium Nukes? Little-studied metal goes critical

    Researchers have measured with far greater accuracy than ever before how much neptunium it would take to make a bomb.

  9. Anthropology

    Ancient Lure of the Lakes: Early Americans followed the water

    Archaeological investigations in Chile indicate that beginning around 13,000 years ago, early American settlers lived at high altitudes during humid periods, when they could set up hunting camps on the shores of lakes.

  10. Astronomy

    Cloudy Findings: A new population shows up in the Milky Way

    A radio telescope has detected a previously unknown population of hundreds of hydrogen clouds in the gaseous halo that surrounds the disk of our galaxy.

  11. Outmuscled: Muscles, not nerve cells, fail in old worms

    In aging worms, the nervous system stays intact but muscles don't.

  12. Earth

    Air-Pollution Pileup: Mediterranean endures emissions from afar

    Although most Mediterranean countries aren't big polluters, the area is a crossroads for pollution-carrying air currents from Europe, Asia, and North America.

  13. Health & Medicine

    Blood Booster: Growth signal shifts cord stem cells into high gear

    A protein called Delta-1 stimulates stem cells in umbilical cord blood to proliferate in a lab dish, attach well to bone marrow when implanted into mice, and even proceed to the animal's thymus to become T cells.

  14. Animals

    Upside Way Down: Video turns fish story on its head

    The first video of whipnose anglerfish reveals them swimming upside down and trolling for prey on the 5,000-meter deep ocean floor.

  15. Math

    Prime Pursuit

    A novel approach for identifying prime numbers provides a long-sought improvement in the theoretical efficiency of prime-detecting algorithms.

  16. Plants

    Why Turn Red?

    Why leaves turn red is a stranger question than why they turn yellow.