In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Your heart beats over 36 million times a year.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
he vertebrate stomach as an example of an organ composed of all four tissue types
Examples of three types of joints found in the body.