Input: Electric motor
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?
Output: electric trolley system

Input: Germans
After World War II, eastern European countries such as the Soviet Union, Poland, Czechoslovakia, Hungary, Romania and Yugoslavia expelled the Germans from their territories. Many of those had inhabited these lands for centuries, developing a unique culture. Germans were also forced to leave the former eastern territories of Germany, which were annexed by Poland (Silesia, Pomerania, parts of Brandenburg and southern part of East Prussia) and the Soviet Union (northern part of East Prussia). Between 12 and 16,5 million ethnic Germans and German citizens were expelled westwards to allied-occupied Germany.

After what war were Germans expelled from their territories?
Output: World War II

Input: Josip Broz Tito
Yugoslavia organized the Yugoslav People's Army (Jugoslavenska narodna armija, or JNA) from the Partisan movement and became the fourth strongest army in Europe at the time. The State Security Administration (Uprava drzavne bezbednosti/sigurnosti/varnosti, UDBA) was also formed as the new secret police, along with a security agency, the Department of People's Security (Organ Zastite Naroda (Armije), OZNA). Yugoslav intelligence was charged with imprisoning and bringing to trial large numbers of Nazi collaborators; controversially, this included Catholic clergymen due to the widespread involvement of Croatian Catholic clergy with the Ustasa regime. Draza Mihailovic was found guilty of collaboration, high treason and war crimes and was subsequently executed by firing squad in July 1946.

Who was charged with brining to trial large numbers of Nazi collaborators?
Output: Yugoslav intelligence

Input: Northwestern University
Northwestern is home to the Center for Interdisciplinary Exploration and Research in Astrophysics, Northwestern Institute for Complex Systems, Nanoscale Science and Engineering Center, Materials Research Center, Institute for Policy Research, International Institute for Nanotechnology, Center for Catalysis and Surface Science, Buffet Center for International and Comparative Studies, the Initiative for Sustainability and Energy at Northwestern and the Argonne/Northwestern Solar Energy Research Center and other centers for interdisciplinary research.

Where is the home of the Materials Research Center?
Output:
Northwestern