have thousands to help them in their calculations. While vacuum tubes are currently seen as really old technology, they were a fundamental cornerstone to the development of modern technological marvels. This DVD explores three films related to vacuum tubes. It has a total run time of 34 minutes. The first film is: Electronics at Work -1943 - This film explores the six basic functions of electronic vacuum tubes and shows how each type of tube is used in various industrial and military applications.; The second film is The Big Idea - 1955 - A fascinating look at the Wuerth Tube Saver, the very earliest of surge protection technologies to come along.; The third film is Radio and Television - 1940 - This film explores shows the various occupations/technologies in ...  (less)

Grounder is a genius, he invents a petrifying ray, turns Sonic to stone, and Hacker and Tails come to the rescue. Sno Problem - When Scratch and Grounder use Robotnik's new Slo-Mo Ray Gun to capture Sonic, Tails rescues him by reversing the gun and turning it on a tribe of friendly Tree Sloth People who become a high speed commando strike force against Robotnik. Full Tilt Tails - Robotnik invents an electron altering generator which makes Scratch and Grounder twice as fast as Sonic. When they lose it and Tails picks it up, Tails speeds through the Mobius countryside leaving disasters and accidents in his wake. Seeing this, Robotnik convinces the villagers that the little fox belongs in jail, and Tails ...  (less)