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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.