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.
It was in 1933 when the military handed Alcatraz Island over to the U.S Justice Department to be used as a high security federal prison. The Justice Department wanted a facility which could hold criminals deemed to be too dangerous for standard prisons.