21.   And according to the federal Centers for Disease Control and Prevention, prevention programs have increased condom use among teenagers without increasing their level of sexual activity.

22.   An independent scientific study has found that the use of ammonia by tobacco companies can dramatically increase the level of nicotine available to smokers.

23.   And sales of one of its blockbuster drugs, Neupogen, which increases white blood cell levels, have softened markedly.

24.   Andro, which is banned in the Olympics, supposedly increases the level of testosterone.

25.   Another edited molecule is a receptor for serotonin, the molecule whose level is increased by antidepressants like Prozac.

26.   Another is hidden fat, such as vegetables and grains smothered in butter, which increases calorie levels considerably.

27.   At the same time, Baren says, the deep relaxation of a hypnotic trance increases the levels of endorphins and enkephalins, natural painkillers the body produces itself.

28.   Because construction of housing projects has dropped to almost nothing, these vouchers have become nearly the only way the federal government can directly increase the level of assistance.

29.   Berman insisted that the best way to combat objectionable speech was to increase the level of debate with more speech.

30.   Both body fat and inactivity can increase blood levels of estrogen.