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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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