The four current NASA pilots who can operate the modified 747 are ex-military aviators who split their time flying other planes including zero-gravity aircraft and T-38 supersonic jets.

MSN: What it's like to fly a plane carrying shuttle - Technology & science - Space | NBC News

Watch Kirobi's zero gravity training below, come back, and then tell us you didn't at least crack a smile.

ENGADGET: Alt-week 3.9.13: Sunstones, knotted vortices and a zero-g robot