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.
The Federal Bureau of Prisons classifies prisons into several categories: 1  United States Penitentiaries. 2  Federal Correctional Institutions. 3  Private Correctional Institutions. 4  Federal Prison Camps. 5  Administrative Facilities. 6  Federal Correctional Complexes.