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  1. Health & Medicine

    When the stomach gets low on acid

    A study in mice shows that a shortage of stomach acid can lead to cancer, apparently as a result of bacterial overgrowth and inflammation.

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  2. Many cyanobacteria make a neurotoxin

    A brain-damaging toxin, once believed to come only from a group of tropical plants and their live-in microbes, turns out to be much more widespread.

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  3. Health & Medicine

    Licorice ingredient ferrets out herpes

    A compound in licorice homes in on lab-grown cells infected with a herpes virus and induces them to self-destruct.

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  4. Paleontology

    Early mammal had newfangled fangs

    A tiny mammal that lived in Colorado about 150 million years ago had hollow teeth that lacked enamel, a characteristic that didn't reappear in mammals for another 100 million years.