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  1. Physics

    Surface reaction recorded in real time

    Ultrafast laser pulses may have for the first time revealed the incredibly rapid, step-by-step progress of a complete chemical reaction on a surface, at the actual speed at which it took place.

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  2. 18923

    Regarding “Cold sliver may sense electron quiver,” micro-, nano-, and pico- are fine. But have mercy and explain zepto-! Joel Faitsch Pittsfield, Mass. The prefix zepto- refers to an amount represented by 10–21, or a billionth of a trillionth.–P. Weiss

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  3. Physics

    Cold sliver may sense electron quiver

    By detecting vibrations of less than an atom's width of a tiny cantilever, physicists have made the most sensitive measurement of force ever by mechanical means.