Life imitating sci-fi:  University of Texas at Dallas nanotechnologists have created super strong artificial muscles, capable of superhuman feats. 

University of Texas at Dallas nanotechnologists have made alcohol- and hydrogen-powered artificial muscles that are 100 times stronger than natural muscles, able to do 100 times greater work per cycle and produce, at reduced strengths, larger contractions than natural muscles.

The buff synthetic muscles could be used in many situations, including autonomous robotics.  The muscles, like real muscles, convert chemical fuel to mechanical energy, getting rid of the need for batteries or wired power.

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