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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.