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The Spiral Track Autonomous Robot (STAR)STAR makes use of an ancient engineering device called an Archimedes screw, which allows the two "tillers" to turn in opposite directions, enabling the robot to move forward, backward and sideways.Future Robots | Hazardous Duty | Robo Clips Resources | Transcript | Bomb Squad Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000 |