First off, there is more than one kind of stem cell. Human stem cells are unique because they have the potential to become a specialized cell and can divide and renew themselves, according to the National Institutes of Health.
Doing Time as a Federal Prison: 1934-63. In 1933, the Army relinquished Alcatraz to the U.S. Justice Department, which wanted a federal prison that could house a criminal population too difficult or dangerous to be handled by other U.S. penitentiaries.
Get tickets to Alcatraz Island and cruise on the San Francisco Bay. Tour Alcatraz, the infamous and notorious former federal prison, which was home to the likes of Al Capone, George Machine Gun Kelley, and Robert The Birdman Stroud.