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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.