11.  Cycles are a natural part of the market order.

12.  Fantasy is a natural part of childhood and has not been known to make devil-worshipers of generations past.

13.  Fire may be a natural part of forest ecosystems, but the circle of life turns slowly in the sky-island forests of desert Arizona.

14.  For him the pursuit of math and science is not just a natural part of growing up, it is a seductive and exhilarating adventure.

15.  Forgetting is a natural part of the learning process, says psychologist Harry Bahrick, a research professor of psychology at Ohio Wesleyan University in Delaware, Ohio.

16.  He recommends making reading a natural part of everyday activities.

17.  Her parents, interviewed in the appendix of the current book, taught their daughter that sex was simply a natural part of life.

18.  However, if infanticide has long been a natural part of animal behavior, then so too, one would expect, has been the fight against it.

19.  It is simply a brutal fact of life in America that guns are a natural part of the environment.

20.  Many even learn that personal vulnerability is a natural part of being a man.