Sandra Bullock spinning wildly, freely in space. ‘Untethered!’ – she remains professional, following communications protocol, completely unable to control her spin or direction. There is no traction in space, hurtling weightless around the planet. One person (George Clooney) has the capacity to save her, because he has a jet-pack. But he has too much to do, with what little resource he has … I won’t spoil the story if you haven’t yet seen the film Gravity, but I will recommend the 3D version, for the tears in space. The gravity of gravity I work in a place where the value…