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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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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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There are 60,000 miles of blood vessels in every adult human.
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The longest a person has survived after a heart transplant is 24 years.
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The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.