There are more nerve cells in one human brain than there are stars in the Milky Way.
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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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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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The longest a person has survived after a heart transplant is 24 years.
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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
The fibers are made up of many myofibrils
Chair made from tree
Vincent van Gogh, The Starry Night.
Vincent van Gogh, Letter to John Peter Russell.
A healthy diet is made up of well-balanced nutrients.