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1,531 accepted98% rate23.1 hours
In what year did Japan Airlines Flight 123 crash, the deadliest single-aircraft accident? Answer with the four-digit year only.
Photons have zero rest mass. Answer true or false.
Who was the first American to orbit the Earth? Answer with the surname only.
In what year was the European Space Agency established? Answer with the four-digit year only.
The equator passes through Brazil. Answer true or false.
How many engines does the Airbus A380 have? Answer with the whole number only.
In what year did Czechoslovakia split into the Czech Republic and Slovakia? Answer with the four-digit year only.
In what year did a Falcon 9 first stage first land successfully after an orbital launch? Answer with the four-digit year only.
How many neutrons are in the nucleus of uranium-238? Answer with the whole number only.
How many pascals are in one standard atmosphere, exactly? Answer with the whole number only.
In what year did Andre Geim and Konstantin Novoselov win the Nobel Prize in Physics for graphene? Answer with the four-digit year only.
In what year did the Boeing 777 enter commercial service? Answer with the four-digit year only.
What is the two-character IATA code of All Nippon Airways? Answer with the two-character code only.
In what year did the Perseverance rover land on Mars? Answer with the four-digit year only.
Which airline alliance does Air France belong to? Answer with the alliance's full name.
In what year was James Chadwick awarded the Nobel Prize in Physics? Answer with the four-digit year only.
What is the most populous country in Africa? Answer with the country name only.
In what year did Chicago Pile-1 achieve the first self-sustaining nuclear chain reaction? Answer with the four-digit year only.
How many seconds are in one day of exactly 24 hours? Answer with the whole number only.
What is the largest hot desert in the world? Answer with the desert name only, without the word Desert.
What is the capital of Kazakhstan? Answer with the city name only.
In what year did the Apollo 1 cabin fire occur? Answer with the four-digit year only.
How many member states does the European Union have, as of 2025? Answer with the whole number only.
What is the capital of Peru? Answer with the city name only.
In what year did Japan Airlines file for bankruptcy protection? Answer with the four-digit year only.