"You have to tell your children about the world they live in, about the discrepancies, about the things that don't work… So you have to bring it up with a scientific orientation so they learn to ask questions, and learn how to say the most difficult thing in the world: 'I don't know'."

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It was practically with people with strings. There was no CG involved, it was just painfully taking Collin [Farrell] and Jessica Biel and putting them upside-down, we built the set upside-down and just try to twist perspective to make it all seem like zero gravity. And it was one of the most difficult things I've ever shot.

— Len Wiseman