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There are 20 feet of blood vessels in each square inch of human skin.
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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.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Cyanide works by making the human body unable to use oxygen.
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The familiar sounds of your heart are made by the heart's valves as they open and close.