Problem: New York City:

Other features of the city's transportation infrastructure encompass more than 12,000 yellow taxicabs; various competing startup transportation network companies; and an aerial tramway that transports commuters between Roosevelt Island and Manhattan Island.

Where does the aerial tramway that starts on Roosevelt Island terminate?
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A: Manhattan Island


Problem: Light-emitting diode:

In September 1961, while working at Texas Instruments in Dallas, Texas, James R. Biard and Gary Pittman discovered near-infrared (900 nm) light emission from a tunnel diode they had constructed on a GaAs substrate. By October 1961, they had demonstrated efficient light emission and signal coupling between a GaAs p-n junction light emitter and an electrically-isolated semiconductor photodetector. On August 8, 1962, Biard and Pittman filed a patent titled "Semiconductor Radiant Diode" based on their findings, which described a zinc diffused p–n junction LED with a spaced cathode contact to allow for efficient emission of infrared light under forward bias. After establishing the priority of their work based on engineering notebooks predating submissions from G.E. Labs, RCA Research Labs, IBM Research Labs, Bell Labs, and Lincoln Lab at MIT, the U.S. patent office issued the two inventors the patent for the GaAs infrared (IR) light-emitting diode (U.S. Patent US3293513), the first practical LED. Immediately after filing the patent, Texas Instruments (TI) began a project to manufacture infrared diodes. In October 1962, TI announced the first LED commercial product (the SNX-100), which employed a pure GaAs crystal to emit a 890 nm light output. In October 1963, TI announced the first commercial hemispherical LED, the SNX-110.

In what state what near-infrared light emission discovered? 
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A: Texas


Problem: Military history of the United States:

Starting in 1940 (18 months before Pearl Harbor), the nation mobilized, giving high priority to air power. American involvement in World War II in 1940–41 was limited to providing war material and financial support to Britain, the Soviet Union, and the Republic of China. The U.S. entered officially on 8 December 1941 following the Japanese attack on Pearl Harbor, Hawaii. Japanese forces soon seized American, Dutch, and British possessions across the Pacific and Southeast Asia, except for Australia, which became a main American forward base along with Hawaii.

 What event led to Africa entering the war?
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A: unanswerable


Problem: Estonia:

Estonia has pursued the development of the e-state and e-government. Internet voting is used in elections in Estonia. The first internet voting took place in the 2005 local elections and the first in a parliamentary election was made available for the 2007 elections, in which 30,275 individuals voted over the internet. Voters have a chance to invalidate their electronic vote in traditional elections, if they wish to. In 2009 in its eighth Worldwide Press Freedom Index, Reporters Without Borders ranked Estonia sixth out of 175 countries. In the first ever State of World Liberty Index report, Estonia was ranked first out of 159 countries.

What digital technology as Estonia been advacning?
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A:
Internet voting