World's smallest propeller could be used for microscopic medicine

If you thought that the most impressive news in shrinking technology these days was smart watches, think again. Scientists are quietly toiling in their laboratories to create robots that are only nanometers—billionths of a meter—in length, small enough to maneuver inside the human body and possibly inside human cells. The impact of these miraculous microscopic machines on medicine can only be imagined, but there is no doubt that it will be significant.

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