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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.
Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
There are more sensory neurons in the tongue than in any other part of the body.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
In 1864, the first barbiturate (barbituric acid) was synthesized.