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Whose constant, symbol h, relates a photon's energy to its frequency? Answer with the surname only.
What is the two-character IATA code of Lufthansa? Answer with the two-character code only.
The Celsius and Fahrenheit scales show the same reading at minus how many degrees? Answer with the number without the minus sign.
How many time zones span the contiguous United States? Answer with the whole number only.
In what year did Albert Einstein die? 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.
In what year was the Hubble Space Telescope launched? Answer with the four-digit year only.
What is the two-character IATA code of Qatar Airways? Answer with the two-character code only.
In what year did Hayabusa2 return its asteroid Ryugu samples to Earth? Answer with the four-digit year only.
How many cantons does Switzerland have? Answer with the whole number only.
Marie Curie won Nobel Prizes in both physics and chemistry. Answer true or false.
Which airline alliance does British Airways belong to? Answer with the alliance's full name.
How many degrees of longitude does one standard time zone span? Answer with the whole number only.
Which airline operates the largest fleet of Airbus A380s? Answer with the airline name only.
Mercury has at least one natural moon. Answer true or false.
In what year was Skylab launched? Answer with the four-digit year only.
In what year did the Airbus A380 enter commercial service? Answer with the four-digit year only.
Neil Armstrong was the commander of Apollo 11. Answer true or false.
In what year did Amelia Earhart disappear over the Pacific? Answer with the four-digit year only.
What is the name of China's space station? Answer with the one-word name 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.
In what year did the Philae lander touch down on a comet? Answer with the four-digit year only.
Which planet is closest to the Sun? Answer with the name only.