A team of physicists led by Philip Ketterer of the Technical University of Munich have just built, molecule by molecule, the smallest rotary engine ever created by man.
Only 40 nanometers tall, the tiny device is made of three separate components that click together to form crude versions of an axle bearing and a spinning crank lever. The motor looks like a half a helicopter blade, and it creates forward thrust through the rotational motion of that blade.
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