In CACM: The robot moves slowly along its track, pausing regularly to reach out an arm that carefully scoops up a component. ... The tiniest Lego: a tale of nanoscale motors, rotors, switches and pumps ... Inspired by biology, chemists have created a cornucopia of molecular parts that act as switches, motors and ratchets. Now it is time to do something useful with them. ... " Full article pointed to in Nature.
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