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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.

    By Ben Harder

  2. Bacterial tresses conduct electricity

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

    By Christen Brownlee

  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.