Economic growth is a tricky concept.

Examines tricky concepts like infinity, topology, and probability through tall tales and anecdotes.

To those of us for whom Frogger still represents the cutting edge, this can be a tricky concept.

Because tricky scientific concepts generally receive mentions instead of explanations, you get a better view of the scientists as people than as scientists.

James Lapine Does not want to bowl you over with some tricky directorial concept.

A tricky concept to grasp at first is that two apparently similar palettes of effects work entirely differently.

Freedom was a very tricky concept Too much could result in imposition on the freedom of another being; freedom could be contradictory.

With these Grammys, though, home is a tricky concept.

Growth, a tricky concept, can breed expansion, temptation and, when good sense goes the way of the two-hand set shot, conflagration.

Though I suspect parental explanation may be required for trickier concepts, you can save a file without even having to know how to type.