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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
- 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.
- Earth
Oops! Tougher arsenic rule retracted
The new EPA administrator has delayed by 60 days the implementation of a final rule issued by the Clinton administration lowering the amount of arsenic allowed in drinking water.
