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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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.
Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.