Everything I know about Fannie and Freddie and oil prices and Dow perturbations is what I heard on the radio this morning.

FORBES: Final Gifts

Aeroplane avionics, for example, are vulnerable to the perturbations caused by neutron particles cascading down through the high atmosphere during a storm.

BBC: UK 'can cope with solar superstorm'

Of course, statistical perturbations and skews can and do occur.

FORBES: What Is Really Happening With Employment?

Two researchers (separated by the Atlantic ocean, rather than the English Channel), have used gravitational perturbations that affect comets, rather than planets, to predict the existence of something that might be a planet, or might be a star depending mainly on how you define a planet or a star.

ECONOMIST: X marks the spot