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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The familiar sounds of your heart are made by the heart's valves as they open and close.