In pictures: Nanotechnology - Building the future from the bottom up
Tiny world

"Nano" comes from the Greek "dwarf". It is used in the metric system to refer to "billionth" - a nanometre (nm) is a billionth of a metre.

Put another way, this is about 1/50,000th the width of a human hair. Normal office paper is about 100,000nm thick.

Nanotechnologists will typically work in the range 1-100nm.

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