Advocated by Nikola Tesla, often known as "Father of the Radio" and inventor of today's wireless world, alternate currents are widely used today. Showcase Tesla's genius in foreseeing the usage of alternate currents with any of these quote gifts with the following quote: "Alternate currents, especially of high frequencies, pass with astonishing freedom through even slightly rarefied gases. The upper strata of the air are rarefied. To reach a number of miles out into space requires the overcoming of difficulties of a merely mechanical nature." Gifts for all inventors, scientists, engineers, and fans who understand that limits are of a merely mechanical nature!