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2,246 accepted98% rate37.8 hours
In what year did Paul Dirac publish his relativistic equation for the electron? Answer with the four-digit year only.
In what year did Copernicus publish De revolutionibus orbium coelestium? Answer with the four-digit year only.
What is the largest country in the world by area? Answer with the country name only.
What is the exact defined speed of light in vacuum, in meters per second? Answer with the whole number only.
How many flavors of lepton are there in the Standard Model? Answer with the whole number only.
What is the two-character IATA code of KLM? Answer with the two-character code only.
What is the IATA code of Paris Charles de Gaulle Airport? Answer with the three-letter code only.
In what year was Tata Airlines, which became Air India, founded? Answer with the four-digit year only.
In what year was CERN founded? Answer with the four-digit year only.
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.
In what year did Clyde Tombaugh discover Pluto? Answer with the four-digit year only.
How many provinces does Canada have? Answer with the whole number 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.
The Celsius and Fahrenheit scales show the same reading at minus how many degrees? Answer with the number without the minus sign.
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 highest mountain in North America? Answer with its official name only, one word.
What is the capital of Morocco? Answer with the city name only.