11.   Laughlin challenged biologists to double-check some of their classic experiments used to explain how DNA works at a molecular level.

12.   Motives of security are used to explain the expansion of NATO.

13.   Moral hazard is basically an insurance term used to explain how imprudent or dishonest behavior is encouraged when people are protected from the adverse consequences of their actions.

14.   Similar scientific and evolutionary arguments, Barrow contends, can be used to explain many of our esthetic preferences.

15.   Teams cannot be up for every game, a rationale that could be used to explain the losses to Navy and Louisville.

16.   The behavior of these strings can be used to explain certain theories of physics that seem contradictory, such as the evolution of black holes.

17.   The brutality and sheer numbers of kidnappings were among the main reasons Russia used to explain its decision to sent troops back into Chechnya.

18.   Buchanan and his advisers are discussing language Buchanan would use to explain his departure, though he has not yet formally begun writing the speech.

19.   Kajang Jaya residents Association secretary K. Ratnam said the forum should have been used to explain to the people the reasons for the problem.

20.   Wolfgang F. Stolper, an Austrian-born economist whose work included a theory used to explain the effect of international trade on wages, has died.