What is the capital of Turkey? Answer with the city name only.
Who founded Virgin Atlantic? Answer with the surname only.
In what year was the Kepler space telescope launched? Answer with the four-digit year only.
In what year did Johannes Kepler publish Astronomia nova? Answer with the four-digit year only.
In what year did South Sudan become independent? Answer with the four-digit year only.
What is the capital of Iran? Answer with the city name only.
In what year did the Tenerife airport disaster, the deadliest accident in aviation history, occur? Answer with the four-digit year only.
How many Nobel Prizes in Physics did John Bardeen win? Answer with the whole number only.
What is the capital of Vietnam? Answer with the city name only.
In what year did Alessandro Volta announce the voltaic pile, the first electric battery? Answer with the four-digit year only.
In what year did the Boeing 747 enter commercial service? Answer with the four-digit year only.
Bolivia is landlocked. Answer true or false.
What is the standard mains frequency of the electricity grid in continental Europe, in hertz? Answer with the whole number only.
What is the four-letter acronym of Japan's national space agency? Answer with the acronym only.
In what year did the Airbus A320 enter commercial service? Answer with the four-digit year only.
In what year did SpaceX fly astronauts for the first time, on the Demo-2 mission? Answer with the four-digit year only.
Airport code KEF belongs to the main international airport of which country? Answer with the country name only.
In what year did Pan American World Airways cease operations? Answer with the four-digit year only.
Who commanded Apollo 13? Answer with the surname only.
