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Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

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