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How many engines does the Boeing 747 have? Answer with the whole number 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 Chelyabinsk meteor explode over Russia? Answer with the four-digit year only.
In what year did the United States purchase Alaska from Russia? Answer with the four-digit year only.
In what year did Theodore Maiman demonstrate the first working laser? Answer with the four-digit year only.
In what year did Niels Bohr publish his model of the hydrogen atom? Answer with the four-digit year only.
What is the flag carrier airline of the Netherlands? Answer with the airline name only.
Whose constant, symbol h, relates a photon's energy to its frequency? Answer with the surname only.
What is the two-character IATA code of Lufthansa? Answer with the two-character code only.
Which airline alliance does British Airways belong to? Answer with the alliance's full name.
Which dwarf planet is the largest object in the asteroid belt? Answer with the name only.
The Celsius and Fahrenheit scales show the same reading at minus how many degrees? Answer with the number without the minus sign.
How many time zones span the contiguous United States? Answer with the whole number only.
What is the capital of New Zealand? Answer with the city name only.
In what year did Albert Einstein die? Answer with the four-digit year only.
In what year did the travel group Thomas Cook and its airline collapse? Answer with the four-digit year only.
In what year was the Hubble Space Telescope launched? Answer with the four-digit year only.
What is the highest mountain in North America? Answer with its official name only, one word.
Who led the team that built Chicago Pile-1, the first nuclear reactor? Answer with the surname only.
What is the capital of Morocco? Answer with the city name only.
What is the two-character IATA code of Qatar Airways? Answer with the two-character code only.
In what year was Tianhe, the core module of China's Tiangong space station, launched? Answer with the four-digit year only.
How many planets in the Solar System have ring systems? Answer with the whole number only.
What is the two-character IATA code of China Eastern Airlines? Answer with the two-character code only.
How many cantons does Switzerland have? Answer with the whole number only.