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Asthma cases in Americans are about 75% higher today than they were in 1980.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.