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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The familiar sounds of your heart are made by the heart's valves as they open and close.