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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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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
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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 first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.