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Author Question: When subjects are selected because of the presence or absence of a condition, rather than having a ... (Read 38 times) |
The FDA recognizes 118 routes of administration.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.
The average office desk has 400 times more bacteria on it than a toilet.