The difference between an empty e-reader and a full one is just one attogram.

一个空的电子阅读器和一个满的电子阅读器相比，差距仅有十的负十八次方克。

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According to John Kubiatowicz, from the University of California, Berkeley, the difference between an empty e-reader and a full one is just one attogram, or 10-18 of a gram.

根据加州大学伯克利分校的教授约翰·库比亚托维兹所说，下载满容的电子书阅览器与空的阅览器相比，差距仅有1微微微克，也就是10-18 克（十的负十八次方克）。

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By refining the system further, he expects to be able to weigh a zeptogram a thousandth of an attogram.

ECONOMIST: Small-scale physics