In 1886, Frank Julian Sprague invented the first practical DC motor, a non-sparking motor that maintained relatively constant speed under variable loads. Other Sprague electric inventions about this time greatly improved grid electric distribution (prior work done while employed by Thomas Edison), allowed power from electric motors to be returned to the electric grid, provided for electric distribution to trolleys via overhead wires and the trolley pole, and provided controls systems for electric operations. This allowed Sprague to use electric motors to invent the first electric trolley system in 188788 in Richmond VA, the electric elevator and control system in 1892, and the electric subway with independently powered centrally controlled cars, which were first installed in 1892 in Chicago by the South Side Elevated Railway where it became popularly known as the "L". Sprague's motor and related inventions led to an explosion of interest and use in electric motors for industry, while almost simultaneously another great inventor was developing its primary competitor, which would become much more widespread. The development of electric motors of acceptable efficiency was delayed for several decades by failure to recognize the extreme importance of a relatively small air gap between rotor and stator. Efficient designs have a comparatively small air gap. [a] The St. Louis motor, long used in classrooms to illustrate motor principles, is extremely inefficient for the same reason, as well as appearing nothing like a modern motor.
What was the transportation advancement made possible by Sprague's designs?
electric trolley system

Bush and Kerry met for the third and final debate at Arizona State University on October 13. 51 million viewers watched the debate which was moderated by Bob Schieffer of CBS News. However, at the time of the ASU debate, there were 15.2 million viewers tuned in to watch the Major League Baseball playoffs broadcast simultaneously. After Kerry, responding to a question about gay rights, reminded the audience that Vice President Cheney's daughter was a lesbian, Cheney responded with a statement calling himself "a pretty angry father" due to Kerry using Cheney's daughter's sexual orientation for his political purposes.
What was the next biggest competitor for television viewers, next to the debate?
Major League Baseball playoffs broadcast simultaneously

The immediate cause of the war resided in the candidacy of a Leopold of Hohenzollern-Sigmaringen, a Prussian prince, to the throne of Spain. France feared encirclement by an alliance between Prussia and Spain. The Hohenzollern prince's candidacy was withdrawn under French diplomatic pressure, but Otto von Bismarck goaded the French into declaring war by altering a telegram sent by William I. Releasing the Ems Dispatch to the public, Bismarck made it sound as if the king had treated the French envoy in a demeaning fashion, which inflamed public opinion in France.
What did France fear by an alliance between Prussia and Spain?
encirclement