CU computer-generated colored light display; CUs of children's smiling faces; children run past camera through classroom; medium shot, children taking their seats behind computer terminals; CU on computer monitor drawing lines, circles, boxes, letters, numbers, and doing simple math; medium CU doctor behind terminal, large display of heart scan in background; CU of scan image; computer simulation of Voyager II flight past Saturn, Uranus, Neptune during the 1980s