Last night I became one of the last cinephiles I know to see Primer, the magnificent little head-trip guided by a steady stream of techtalk that became the 2004 Sundance Grand Jury Prize winner. I don’t think I’d be giving anything away to say the plot concerns the building of a time machine by two friends and the paradoxical fallout in their lives. Since tomorrow MIT is hosting the one and only time-travelers convention, now would be a great time for those with opinions as to whether Primer and other time-travel movies (other than Spirit of ’76) got the science right to post their thoughts in the comments below. We may be able to grade you tomorrow.

RELATED: One imdb poster’s theory about what happens in Primer.