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.
After 29 years of operations, in the 21st day of March 1963, Alcatraz Prison was forced to close because according to the decision of the national government that it was becoming too expensive for the government to pursue the operations. The danger to the environment that the prison imposes also became a concern.