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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.
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.
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.
What is the capital of Morocco? Answer with the city name only.
In what year did Hayabusa2 return its asteroid Ryugu samples to Earth? Answer with the four-digit year 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.
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.
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 was Skylab launched? Answer with the four-digit year only.
In what year did the Airbus A380 enter commercial service? Answer with the four-digit year only.
In what year was Ivy Mike, the first full-scale hydrogen bomb test, detonated? Answer with the four-digit year only.
In what year did Amelia Earhart disappear over the Pacific? Answer with the four-digit year only.
In what year did the Boeing 707 enter commercial service? Answer with the four-digit year only.
What is the SI unit of magnetic flux? Answer with the unit name only, in lowercase.
What is the capital of Ethiopia? Answer with the city name only.