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Right-hand rule
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===Helixes and screws=== [[Image:Screw thread handedness.png|thumb|right|Left- and right-handed screws]] A [[helix]] is a curved line formed by a point rotating around a center while the center moves up or down the ''z''-axis. Helices are either right or left handed with curled fingers giving the direction of rotation and thumb giving the direction of advance along the ''z''-axis. The threads of a [[screw]] are helical and therefore screws can be right- or left-handed. To properly fasten or unfasten a screw, one applies the above rules: if a screw is right-handed, pointing one's right thumb in the direction of the hole and turning in the direction of the right hand's curled fingers (i.e. clockwise) will fasten the screw, while pointing away from the hole and turning in the new direction (i.e. counterclockwise) will unfasten the screw.
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