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How many engines did the McDonnell Douglas DC-10 have? Answer with the whole number only.
In which country is the temple complex of Angkor Wat? Answer with the country name 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.
What is the two-character IATA code of Etihad Airways? Answer with the two-character code only.
How many astronauts flew on Apollo 11? Answer with the whole number only.
In what year did Alaska Air Group complete its acquisition of Hawaiian Airlines? Answer with the four-digit year only.
Which US airline did Herb Kelleher co-found? Answer with the one-word name only, without the word Airlines.
In what year did Apollo 13 suffer its oxygen tank explosion? Answer with the four-digit year only.
How many states does Australia have, not counting its territories? Answer with the whole number only.
In what year did the United States purchase Alaska from Russia? 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.
Which dwarf planet is the largest object in the asteroid belt? Answer with the name only.
What is the two-character IATA code of Lufthansa? Answer with the two-character code 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.
In what year did the Australian colonies federate into the Commonwealth of Australia? Answer with the four-digit year only.
What is the capital of New Zealand? Answer with the city name only.
How many planets in the Solar System have ring systems? Answer with the whole number only.
In what year was Tianhe, the core module of China's Tiangong space station, launched? 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 did Albert Einstein die? 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.