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 8 most infamous criminals at America's toughest prison. Known as the Alcatraz of the Rockies, the ADX maximum security prison in Florence Colorado is home to some of the most violent criminals in US history. The ADX opened in 1994 to fill the void left by the now-shuttered penitentiaries of Alcatraz and Marion.