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In what year did LIGO record GW150914, the first direct detection of gravitational waves? Answer with the four-digit year only.
In what year did the Panama Canal open? Answer with the four-digit year only.
Lufthansa is headquartered in France. Answer true or false.
In what year was Voyager 1 launched? Answer with the four-digit year only.
Saturn's average density is lower than that of water. Answer true or false.
What is the two-character IATA code of Emirates? Answer with the two-character code only.
Airport code FCO belongs to the main international airport of which city? Answer with the city name only.
In what year did London Heathrow's Terminal 5 open? Answer with the four-digit year only.
In what year did Edwin Hubble publish the relation between galaxy distance and recession velocity? Answer with the four-digit year only.
How many Great Lakes of North America are there? Answer with the whole number only.
Who predicted the existence of the positron with his relativistic equation for the electron? Answer with the surname only.
In what year did Brasilia become the capital of Brazil? Answer with the four-digit year only.
What is the SI base unit of amount of substance? Answer with the unit name only, in lowercase.
Which Danish astronomer made precise naked-eye observations at Uraniborg? Answer with the surname only.
How many characters long is an ICAO airport code? Answer with the whole number only.
What is the largest country in Africa by area? Answer with the country name only.
Gamma rays have a higher frequency than radio waves. Answer true or false.
In what year was the kilogram redefined in terms of the Planck constant, taking effect on 20 May? Answer with the four-digit year only.
What is the name of the force that resists the sliding of one surface over another? Answer with the one-word name only, in lowercase.
What is the capital of the US state of Pennsylvania? Answer with the city name only.
In what year was the Three Mile Island nuclear accident? Answer with the four-digit year only.
How many emirates make up the United Arab Emirates? Answer with the whole number only.
What is the largest moon in the Solar System? Answer with the name only.
What is the capital of Finland? Answer with the city name only.
How many Space Shuttle orbiters flew in space? Answer with the whole number only.