In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
A colourful male guppy courting a female guppy: What are the influences of mate selection by female
Male Urogenital System
What Percentage of U.S. Married Women Ages 40-44 Have Never Given Birth?
Percentage of Americans Living in Communities with a Fluoridated Water Supply, by State. 2012