I love that film, but it&#x27;s kind of weird that it doesn&#x27;t mention what&#x27;s probably the most important invention that makes this type of computer possible: The torque amplifier.<p>All the devices shown suffer power losses between input and output, some of them severe. A torque amplifier has two shafts that are 1:1 geared for speed but the output shaft has extra power taken from a third supply shaft, like the supply to a logic gate that lets it drive more output power than it draws from its inputs.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Torque_amplifier" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Torque_amplifier</a>