Felecia Ford, age 16, of Glendale, Ariz., for her question:

WHAT EXACTLY IS CAFFEINE?

Caffeine is an odorless, slightly bitter chemical formula. It is a stimulant and is found in small amounts in tea, coffee and some soft drinks. When taken in small amounts, caffeine increases the circulation and is considered by most medical experts to be harmless.

When taken in large amounts, caffeine can cause nervousness and loss of sleep. It also may cause headaches and digestive disturbances.

Caffeine dissolves in water and has crystals that look like needles.

Caffeine was produced from plants in the pure form in 1820s. It can now be made in the laboratory.

       Caffeine is used as a stimulant. for the  heart  and  nervous system      ¬in certain disorders. It is also used by some doctors as a remedy for poisoning by alcohol and other drugs that depress or slow down the nervous system.