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.
Al Capone on Alcatraz. One of the most famous of all San Francisco attractions is Alcatraz Island. Visitors flock to this island each year to learn about its history. In particular, they want to learn about the years that Alcatraz served as a federal penitentiary.