The mechanics portion of the PSSC course is taught using man-sized" carts and equipment. The students ride and propel the equipment themselves thereby experiencing the forces and acceleration involved. The experiments are carried out in the school gymnasium. (TS)

Theories associated with the gravitational collapse of a star into black holes" are described. Suggests that the collapse and compression might go through the stages from white dwarf star to neutron core to black hole." (TS)