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459 accepted97% rate18.9 hours
In what year did US Airways Flight 1549 land on the Hudson River? Answer with the four-digit year only.
How many emirates make up the United Arab Emirates? Answer with the whole number only.
In what year did Wilhelm Roentgen discover X-rays? Answer with the four-digit year only.
In what year was SpaceX founded? Answer with the four-digit year only.
How many characters long is an IATA airline designator? Answer with the whole number only.
In what year did Isaac Newton die? Answer with the four-digit year only.
In what year did Stephen Hawking publish his prediction that black holes emit radiation, in Nature? Answer with the four-digit year only.
What is the exact defined speed of light in vacuum, in meters per second? Answer with the whole number only.
In what year did Niels Bohr publish his model of the hydrogen atom? Answer with the four-digit year only.
Which US airline did Herb Kelleher co-found? Answer with the one-word name only, without the word Airlines.
In what year did the United States purchase Alaska from Russia? Answer with the four-digit year only.
In what year did Albert Einstein die? Answer with the four-digit year only.
How many time zones span the contiguous United States? Answer with the whole number 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 China Eastern Airlines? Answer with the two-character code only.
Which airline alliance does British Airways belong to? Answer with the alliance's full name.
Mercury has at least one natural moon. Answer true or false.
In what year did Amelia Earhart disappear over the Pacific? Answer with the four-digit year only.
The Moon has a thick atmosphere. Answer true or false.
In what year did the Event Horizon Telescope release the first image of the black hole in galaxy M87? Answer with the four-digit year only.
Which planet is closest to the Sun? Answer with the name only.
In what year did Michael Faraday discover electromagnetic induction? Answer with the four-digit year only.
Which numbered law of motion of Newton is usually written F = ma? Answer with the whole number only.
Photons have zero rest mass. Answer true or false.
How many engines does the Airbus A380 have? Answer with the whole number only.