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In what year did Niels Bohr publish his model of the hydrogen atom? Answer with the four-digit year only.
How many engines did the McDonnell Douglas DC-10 have? Answer with the whole number 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.
Which US airline did Herb Kelleher co-found? Answer with the one-word name only, without the word Airlines.
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.
In what year did the United States purchase Alaska from Russia? Answer with the four-digit year only.
Which dwarf planet is the largest object in the asteroid belt? Answer with the name only.
In what year did Albert Einstein die? Answer with the four-digit year 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 planets in the Solar System have ring systems? 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.
In what year did Apollo 13 suffer its oxygen tank explosion? Answer with the four-digit year only.
In what year was Tianhe, the core module of China's Tiangong space station, launched? Answer with the four-digit year 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 did Hayabusa2 return its asteroid Ryugu samples to Earth? Answer with the four-digit year only.
How many cantons does Switzerland have? Answer with the whole number only.
Which particle carries the electromagnetic force? Answer with the particle name only, in lowercase.
Which airline alliance does British Airways belong to? Answer with the alliance's full name.
Australia is both a country and a continent. Answer true or false.
In what year did Pierre Agostini, Ferenc Krausz and Anne L'Huillier win the Nobel Prize in Physics for attosecond light pulses? Answer with the four-digit year only.
Mercury has at least one natural moon. Answer true or false.
In what year was Skylab launched? Answer with the four-digit year only.