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In what year did Stephen Hawking publish his prediction that black holes emit radiation, in Nature? Answer with the four-digit year only.
What is the capital of Cuba? Answer with the English name of the city only.
What is the two-character IATA code of Norwegian Air Shuttle? Answer with the two-character code only.
Greenland is part of the Kingdom of Denmark. Answer true or false.
In what year was Etihad Airways founded? Answer with the four-digit year only.
In what year did fragments of Comet Shoemaker-Levy 9 hit Jupiter? Answer with the four-digit year only.
How many US states border Mexico? Answer with the whole number only.
In what year did Hawaii become a US state? Answer with the four-digit year only.
How many countries share a land border with China? Answer with the whole number only.
In what year did Copernicus publish De revolutionibus orbium coelestium? Answer with the four-digit year only.
How many spacetime dimensions does M-theory have? Answer with the whole number only.
What is the exact defined speed of light in vacuum, in meters per second? Answer with the whole number only.
What is the two-character IATA code of KLM? Answer with the two-character code only.
In what year did the Chelyabinsk meteor explode over Russia? Answer with the four-digit year only.
What is the IATA code of Paris Charles de Gaulle Airport? Answer with the three-letter code only.
What is the capital of Pakistan? Answer with the city name only.
In what year did Niels Bohr publish his model of the hydrogen atom? Answer with the four-digit year only.
In what year was Tata Airlines, which became Air India, founded? Answer with the four-digit year only.
In what year did Clyde Tombaugh discover Pluto? Answer with the four-digit year only.
How many provinces does Canada have? Answer with the whole number only.
In which country is the temple complex of Angkor Wat? Answer with the country name only.
Which US airline did Herb Kelleher co-found? Answer with the one-word name only, without the word Airlines.
In what year did the United States purchase Alaska from Russia? Answer with the four-digit year only.
How many states does Australia have, not counting its territories? Answer with the whole number only.
Whose constant, symbol h, relates a photon's energy to its frequency? Answer with the surname only.