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The familiar sounds of your heart are made by the heart's valves as they open and close.
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.
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.