Changes

A '''Tractor beam''' is a technology found in science fiction stories, which involves a beam of energy that applies an attractive force on an object it is targeted at.  The typical example is one spaceship using a tractor beam to grab another and either capture or tow it.

A '''Tractor beam''' is a technology found in [[science fiction]] stories, which involves a [[beam]] of [[energy]] that applies an attractive [[force]] on an object it is targeted at.  The typical example is one spaceship using a tractor beam to grab another and either capture or tow it.

A variation on the tractor beam is the '''Pressor Beam''', which applies a repulsive force on an object it is targeted at to push it away.  

A variation on the tractor beam is the '''Pressor Beam''', which applies a repulsive force on an object it is targeted at to push it away.