They turned an electroactive polymer into an actuator so that the material could change to exert force with an electrical signal, basically creating an exomuscle.

FORBES: Nanotech On The Front Lines

Its prototype Turing machine uses a set of electroactive polymer muscles to push memory elements into place and squeeze piezoresistive switches, performing virtually any calculation through flexing.

ENGADGET: Turing machine built from artificial muscles may lead to smart prosthetics