21.   Finding work is easier than keeping it, since children often get sick, child care arrangements collapse, cars break down, and layoffs arise.

22.   Growth regulation breaks down and cancer starts.

23.   Heat breaks down cell structures, increasing the amount of beta-carotene and lycopene, a cancer-fighting antioxidant found in tomatoes.

24.   In an attempt to hang on to the match, Sampras found a burst of energy in the third set, able to fight back from a break down.

25.   It is just as much a tradition for every competition to at some point break down into scandal, controversy and tears.

26.   Its genes were changed to suppress an enzyme during ripening that normally breaks down pectin.

27.   Once these constellations are in place, replacements will be needed regularly as satellites burn out and break down.

28.   Organic matter is important as it boosts soil porosity, crucial to camellia health, as well as acidity as the pine bark breaks down.

29.   Scientists speculate that cooking breaks down nutrients so that they can be better absorbed into the digestive tract.

30.   Small-time gambler Sean Penn finds himself trapped among the far from merciful denizens of a desert hellhole after his car breaks down.