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Primer (2004)
Movie
Released
77 minutes. Two engineers' spare-time experiment becomes a problem of trust as well as time travel. Workshop conversations and unshowy settings make the invention feel like something assembled by people with other jobs. The film is dense, so a short slot will not make it effortless viewing; choose it for a puzzle that rewards discussing what the characters have done.
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About Primer
A group of fledgling inventors discover a complex method to manipulate reality. At first, they successfully game the stock market with it, but the consequences of the invention start to catch up with them.