11.   Even as some of these regions gain population overall, their central cores continue to lose people.

12.   From this central core, the show spreads out in several directions.

13.   Inside, a spiral staircase wound around a central core containing utilities while a series of wedge-shaped rooms were furnished with tubular modern furniture.

14.   Instruments aboard the Pathfinder station have detected evidence of a magnetic field generated within the planet, and signs that Mars contains a central metallic core.

15.   It is the central core of comprehensibility.

16.   It also has one of the highest concentrations of poverty in the central core.

17.   It would consist of a central core and plug-in rooms, factory-delivered, that could be switched as easily as appliances.

18.   That is, a population headed toward extinction responds by contracting inward, reducing its range to a central core.

19.   The central core was rebuilt, and its blond primavera wood panels were replaced.

20.   The race was now on to do a decisive experiment, that of inserting the central core of the telomerase gene into human cells grown in a test tube.