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439 accepted98% rate20.0 hours
In what year did Niels Bohr publish his model of the hydrogen atom? Answer with the four-digit year only.
In what year did Clyde Tombaugh discover Pluto? 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 Qatar Airways? 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.
In what year did the Boeing 707 enter commercial service? Answer with the four-digit year only.
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.
How many engines does the Airbus A380 have? Answer with the whole number only.
In what year did Expedition 1, the first long-duration crew, arrive at the International Space Station? 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.
How many seconds are in one day of exactly 24 hours? Answer with the whole number only.
In what year did Japan Airlines file for bankruptcy protection? Answer with the four-digit year only.
Which strait separates Spain from Morocco? Answer with the strait name only, without the words Strait of.
Pluto is larger than Earth's Moon. Answer true or false.
The Amazon River flows into the Pacific Ocean. Answer true or false.
In what year was the James Webb Space Telescope launched? Answer with the four-digit year only.