1.   He has helped turn playing defensive football into a science and is the author of four books on the subject.

2.   He sent letters, held private meetings with lobbyists, pressured fellow Republicans and ultimately helped turn back a House revolt against the tax break.

3.   But strength in certain technology companies helped turn the market around.

4.   Strength in certain technology companies helped turn the market around.

5.   The iron-water reaction, said Krasnopolsky, helped turn Mars into its rusty-red color.