Vol. 158 No. #4

More Stories from the July 22, 2000 issue

  1. Physics

    Device Sees More inside Live Cells

    A new type of optical microscope, which can discern objects smaller than a supposedly fundamental limit for visible-light viewing, may make it possible to see finer details of the insides of living cells.

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  2. Animals

    Flowers, not flirting, make sexes differ

    Thanks to lucky circumstances, bird researchers find rare evidence that food, not sex appeal, makes some male and female hummingbirds look different.

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  3. Sexual orientation linked to handedness

    A metanalysis reveals right-handedness is more common among heterosexuals than homosexuals, suggesting a neurobiological basis for sexual orientation.

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  4. E. coli toxin shows its deadly touch

    A toxin from a bacterium that causes food poisoning appears to kill cells by interacting with a protein called Bcl-2.

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  5. Earth

    Greenland’s ice is thinner at the margins

    The central portion of Greenland's ice sheet is, on the whole, not getting any thinner, but most margins of the ice sheet are thinning substantially and contributing to rising sea levels.

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  6. Health & Medicine

    Edible vaccine spawns antibodies to virus

    Genetically engineered potatoes can deliver an edible vaccine against Norwalk virus, a common diarrhea-causing pathogen.

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  7. Astronomy

    Dead stars may masquerade as ingenues

    A heavenly deception in which dead stars lie about their ages could throw into disarray theories describing some of the densest objects in the cosmos.

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  8. Sleepers yield memorable brain images

    Rapid-eye-movement sleep may help consolidate some newly acquired memories, brain scans suggest.

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  9. Astronomy

    The smashup that rejuvenates

    For some elderly stars, the fountain of youth may be only a collision away.

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  10. Astronomy

    Astronomers get radio protection

    Astronomers studying the universe at millimeter-wave energies-the high-frequency portion of the radio spectrum-were given an official guarantee last month that commercial satellites and other communication devices won't interfere with the scientists' observations.

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  11. How butterflies can eat cyanide

    Some newly recognized chemical wizardry lets some Heliconius caterpillars thrive on leaves that defend themselves with cyanide.

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  12. Excuse me, dear, which octopus are you?

    Male blue-ringed octopuses get pretty far along in their courtship before they determine whether their partner is a female.

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  13. Wasps: Mom doesn’t like you best

    Female wasps that found a colony together show no favoritism toward their own offspring when the adults feed larvae.

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  14. Protein helps the brain connect

    Neuroligins may help brain cells form specialized links known as synapses.

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  15. Brain, heal thyself

    The rodent brain can be stimulated to replace damaged cells with new ones.

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  16. Man-made thymus churns out immune cells

    Scientists have constructed an artificial thymus to make immune cells in the laboratory.

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  17. Health & Medicine

    Enzyme needed to degrade acetaldehyde

    A shortage of the enzyme ALDH-2, which is needed to break down alcohol in the body, causes a buildup of the cancer-linked chemical acetaldehyde, perhaps explaining why alcoholics lacking ALDH-2 have high rates of mouth and throat cancers.

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  18. Health & Medicine

    Gene mutation for color blindness found

    Scientists have identified the gene that is mutated in people who have color blindness on the Pacific island of Pingelap, perhaps paving the way for genetic screening.

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  19. Tech

    The Little Engines That Couldn’t

    Tired of grinding their gears, micromachine researchers turn to surface science.

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  20. Pass the Genes, Please

    Gene swapping muddles the history of microbes.

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