Why is Jason Reitman, the upscale, zeitgeist-assessing, Telluride- and Sundance-attuned director of The Front Runner, Up In The Air, Tully, Young Adult, Thank You For Smoking and Juno…why has Reitman decided to abandon his Renaissance Man, X-factor, thoughtful-cool-cat profile by directing a Ghostbusters movie, of all things?

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