Jonas Salk (October 28, 1914 - June 23, 1995) is the discoverer/inventor of the eponymousSalk vaccine (see polio vaccine). This was one of the first successful attempts at immunization against a virus, specifically the Poliomyelitis virus. The vaccine provides the recipient with immunity against Polio, and was seminal in the near eradication of a once widely-feared disease.
... muscle that allows voluntary control over urination.
In the human female, the urethra is about 1-1.5 inches (25-38 mm) long and opens in the vulva between the ...