11.   The figure would be reduced by an unknown factor if smoking rates plummet in the next quarter century and related illnesses decrease as well.

12.   The World Health Organization has predicted that within the next quarter century, chronic diseases will overtake infectious ones as the major disease burden for the developing world.

13.   There, they plan to work side by side for the next quarter century, puzzling out the mysteries of life in zero gravity.

14.   A mix of old animosities and deadly new technologies promises to make the next century a dangerous one.

15.   Hefner is now focused on the next century, particularly electronic communication.