Polio Vaccine turns 50 today

One of the greatest achievements in medicine of the 20th century celebrates its "birthday" on this date.

"The vaccine - approved by the federal government on April 12, 1955 -got to different regions faster than others, and broad distribution took a number of years to achieve.
But when it did, it all but wiped out the polio virus around the nation. "

full story: http://www.cbsnews.com/stories/2005/04/12/health/main687379.shtml