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In what year did Niels Bohr publish his model of the hydrogen atom? Answer with the four-digit year only.
In what year did Clyde Tombaugh discover Pluto? Answer with the four-digit year 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.
What is the two-character IATA code of Lufthansa? Answer with the two-character code only.
In what year did the United States purchase Alaska from Russia? Answer with the four-digit year only.
Whose constant, symbol h, relates a photon's energy to its frequency? Answer with the surname only.
In what year did Albert Einstein die? Answer with the four-digit year only.
How many planets in the Solar System have ring systems? Answer with the whole number only.
How many time zones span the contiguous United States? Answer with the whole number 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 Tianhe, the core module of China's Tiangong space station, launched? 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.
What is the two-character IATA code of Qatar Airways? Answer with the two-character code 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.
What is the two-character IATA code of Qantas? Answer with the two-character code only.
Which airline alliance does British Airways belong to? Answer with the alliance's full name.
How many degrees of longitude does one standard time zone span? Answer with the whole number only.
Mercury has at least one natural moon. 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.
In what year did Amelia Earhart disappear over the Pacific? Answer with the four-digit year only.
What is the name of China's space station? Answer with the one-word name only.
In what year did the Boeing 707 enter commercial service? Answer with the four-digit year only.