Primer is a 2004 American science fiction drama film about the accidental discovery of a means of time travel. The film was written, directed, acted, edited, produced
and its music composed by Shane Carruth, a mathematician and a former engineer, and was completed on a budget of $7,000. Carruth's goal was to portray scientific discovery in a down-to-earth and realistic manner. He argued that many of the greatest breakthrough scientific discoveries in history have occurred by accident, in locations no more glamorous than Aaron's garage.