calculus in prison

from the WSJ article on factories lacking skilled workers:

While community colleges and technical schools struggle to keep up with demand for skilled workers, some prisons are trying to help. At California's San Quentin prison, the machine shop offers training to prepare prisoners to pass exams demonstrating skills in such areas as operating computer-controlled lathes and mills. Some inmates get classes in calculus and trigonometry to help them work with machinery.

MAY 6, 2011
Help Wanted on Factory Floor
by James R. Hagerty