For a liquid piston to work, its surface must be stable in the face of rapidly changing pressures.

ECONOMIST: An engine made of water

As with every game of rugby, it must be the stable platform on which England can build.

BBC: Injury-hit Wallabies look vulnerable

Man must be at the center of a universe on a stable planet, or else the core Catholic claim that the omnipotent ruler of the cosmos could satisfy his sense of justice only by sending his son here to be tortured to death begins to seem a little frayed.

NEWYORKER: Moon Man

Just one last point - and I'm not sure, now, if I'm hearing belts and braces being securely fastened, or the sound of a stable door closing long after the horse has bolted but might there just be paperwork that all involved must update, sign, seal and deliver just in case either man is reinstated?

BBC: The 'dangling' Lib Dem Two: the latest