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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
The familiar sounds of your heart are made by the heart's valves as they open and close.
Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
The horizontal fraction bar was introduced by the Arabs.
Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.