He had a habit of ripping pages out once he had read them and stuffing them into his pocket or of letting them drift to the ground so as to lessen the freight.

ECONOMIST: American poets

But what these gentlemen are going to be able to do is when the news media starts seeing its attention drift to other things but there's still enormous needs on the ground, these two gentlemen of extraordinary stature I think are going to be able to help ensure that these efforts are sustained.

WHITEHOUSE: Presidents Obama, Bush, & Clinton: Help for Haiti

For GPS, this is an enormous issue because it turns out that the clocks on the satellites drift by almost 40, 000 nanoseconds per day relative to the clocks on the ground because they are high above the earth's surface (and therefore in a weaker gravitational field) and are moving fast relative to the ground.

BBC: Meet the world's director of time