1.   How to explain the shift from virtual silence to obsession?

2.   Demographers say the tendency for women to have children later in life helps explain the shift.

3.   Still, investors and analysts are at a loss to explain the shift in expectations this week.

4.   The severity of the economic crisis helps explain the shift.

5.   The shift may be explained, in part, by changes in staff.

6.   The shift was explained largely by the introduction of a new voting system, under which Israelis voted separately for prime minister and for the parties in the Parliament.

7.   To explain shifts in demand, they look for changing relative prices.

8.   Two factors explain that shift, Greenberg said.

9.   While picking at her chicken sandwich, Ms. Durbin explained the shift at The Voice.

10.   Explaining the shift, Bush aides said they did not realize during the campaign that carbon dioxide was not a pollutant under the Clean Air Act.