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.
Alcatraz Prison Closes. The notorious prison was closed for good on March 21st, 1963. What was once one of the worldâs most feared prisons, grimly isolated on a small island in San Francisco Bay, is now a popular tourist attraction.