The STAR uses two screws (one left-hand screw and one right-hand screw) to propel itself along the ground. Rotating the screws in different directions allows the robot to move forwards ...

left-handed screws. Scientists at the University of Bonn have now demonstrated the existence of right-handed and left-handed "magnetic vortices". Through their research, in collaboration with ...

Q: Why do bicycles have standard right-hand threads on the right pedal, but left-hand threads on the left pedal? A lot of people believe this is to prevent the pedals from unscrewing and falling ...