Vol. 171 No. #15
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More Stories from the April 14, 2007 issue

  1. Planetary Science

    Cavernous findings from Mars

    Images taken by a Mars-orbiting spacecraft show what appear to be caves on the Red Planet.

  2. Health & Medicine

    Augmenting the good cholesterol

    A reconstituted version of good cholesterol may lessen the amount of plaque that accumulates in arteries and render existing plaque less dangerous.

  3. Rats take fast route to remembering

    Rats use background knowledge about what they have already learned to remember relevant new material surprisingly quickly.

  4. Health & Medicine

    Even outdoors, generators pose risks

    Portable electricity generators are frequently the culprit in domestic carbon monoxide poisonings—even when the devices sit outside the home.

  5. Chemistry

    Enzymes release caged chemicals

    A new controlled-release technology relies on enzymes to unshackle a chemical only when and where it's needed.

  6. Health & Medicine

    New agent to spy clogged arteries

    To improve the detection of harmful arterial plaques, researchers have modeled a nanoparticle on a natural material: good cholesterol.

  7. Materials Science

    Color-tunable sunglasses

    Engineers have developed sunglasses that can change from dark, filtering hues to clear—and back—at the flip of a switch.

  8. Chemistry

    Gene dispensers

    A new gene therapy technique releases genetic material from successive nanoscale layers of DNA as sheets of polyester that hold them in place slowly degrade.

  9. Primate’s Progress: Macaque genome is usefully different

    A group of 35 labs has unveiled a draft of the genome of the rhesus macaque, the most widely used laboratory primate and a cousin to people.

  10. Health & Medicine

    Bug versus Bug: Insect virus makes a viable flu vaccine

    A new influenza vaccine churned out by caterpillar cells infected with a genetically engineered virus effectively prevents the flu.

  11. Paleontology

    Ancient Extract: T. rex fossil yields recognizable protein

    New analyses of a Tyrannosaurus rex leg bone reveal substantial remnants of proteins that strengthen the link between modern birds and dinosaurs.

  12. Female Stem Cells Flourish: Sex difference could affect therapies

    Certain adult stem cells from female mice regenerate better than those from males, indicating that not all stem cells are created equal.

  13. Physics

    Quantum Capture: Photosynthesis tries many paths at once

    The wavelike behavior of energy in chlorophyll might explain how plants are so efficient at using solar energy.

  14. Health & Medicine

    Agents of Metastasis: Four proteins conspire in breast cancer spread

    Four proteins work together to assist cancer growth and metastasis, and drugs against them inhibit both processes, tests in mice suggest.

  15. Anthropology

    Disinherited Ancestor: Lucy’s kind may occupy evolutionary side branch

    A controversial analysis of a recently discovered jaw from a 3-million-year-old Australopithecus afarensis puts Lucy's species on an evolutionary side branch that eventually died out.

  16. Materials Science

    Taken for a Spin

    Considering silk from the spider's perspective may offer the best chance of replicating these creatures' tough threads.

  17. Faster, Cheaper, Better

    Methods now under development could make DNA sequencing quicker and less expensive, paving the way for the day when treatments can be tailored to each person's genetic profile.

  18. Humans

    Letters from the April 14, 2007, issue of Science News

    Heated comments I am disappointed in your article on the latest Intergovernmental Panel on Climate Change (IPCC) summary (“From Bad to Worse: Earth’s warming to accelerate,” SN: 2/10/07, p. 83). It was a political summary, not the 1,500 page report that’s due in May 2007. How often have you seen a scientific summary published 3 […]