Looper

Ed. note: What are the Top 20 Movies of 2012? We asked our film critic Jordan Hoffman (who previously put together a list of the Best Movies of the first half of the year) to compile a list of the Best of 2012 of all the many movies he saw this year.

In the new sci-fi hit 'Looper,' starring Bruce Willis, Joseph Gordon-Levitt and Emily Blunt, the mob uses “Loopers” and time travel to kill targets in the 30-year past. But how much of the film is based on actual hard science?