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  1. Health & Medicine

    Cells in heart can regenerate dead tissue

    Stem cells in heart tissue that has survived a heart attack can be prodded to regenerate dead portions of the injured organ.

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  2. Bacterial tresses conduct electricity

    New research suggests that several species of Geobacter bacteria use hairlike structures known as pili to move electrons.

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  3. 19570

    This article makes a comparison: “A LED can last for up to 100,000 hours compared with the 1,000-hour lifetime of a typical lightbulb and the 10,000-hour lifetime of a typical fluorescent lightbulb.” This is misleading in comparing the maximum LED lifetime with typical bulb lifetimes. The typical lifetime of an LED depends on the application.