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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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People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.
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The longest a person has survived after a heart transplant is 24 years.
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Cyanide works by making the human body unable to use oxygen.
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There are 60,000 miles of blood vessels in every adult human.