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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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There are more bacteria in your mouth than there are people in the world.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Approximately 25% of all reported medication errors result from some kind of name confusion.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.