1.   Amid the apocalyptic talk, Koskinen acknowledged the slippery nature of the problem.

2.   Even more troubling than its possible ineffectiveness, according to Boston attorney Harvey Silverglate, is the slippery nature of a law that punishes unpopular thought.

3.   Former Labor Department Secretary Robert Reich is a classic example of the slippery nature of memory.

4.   The disparity illustrates the slippery nature of e-commerce statistics.

5.   But Davenport overcame her aversion for the slippery nature of grass, and came to Wimbledon this year with a different attitude.