21.   Among other risers were chemicals, which were also bolstered by the dollar.

22.   And like AZT, the new chemicals can be extremely toxic.

23.   And the chemicals are expensive.

24.   And the chemical can be absorbed through the skin.

25.   And where naturally occurring chemicals are extremely rare, the value of looking for them is offset by the high cost of such a task.

26.   And there are numerous warehouses where dangerous chemicals are stored, often on blocks that are partly residential.

27.   Another dangerous chemical is acetone, an ingredient found in nail-polish remover.

28.   At about the same time, one research team concluded that Gulf veterans are sicker than ones who served elsewhere, while another said chemicals may be to blame.

29.   Because the new chemicals are preventative, it will be important that cotton farmers use them early in the growing cycle to curb the whitefly population, Minch said.

30.   -- If chemicals have been used for termite control, do not disturb or disrupt the termiticide treated soil barrier near the foundation.