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2,207 accepted98% rate26.3 hours
How many characters long is an ICAO airport code? Answer with the whole number only.
In what year did US Airways Flight 1549 land on the Hudson River? Answer with the four-digit year only.
Gamma rays have a higher frequency than radio waves. Answer true or false.
How many hexagonal segments make up the James Webb Space Telescope's primary mirror? Answer with the whole number only.
In what year was the Nobel Prize in Physics awarded for the invention of efficient blue LEDs? Answer with the four-digit year only.
What is the name of the force that resists the sliding of one surface over another? Answer with the one-word name only, in lowercase.
Light travels faster in water than in a vacuum. Answer true or false.
In what year was Space Shuttle Columbia lost during re-entry? Answer with the four-digit year only.
Which sea lies between Italy and the Balkan Peninsula? Answer with the sea name only, without the word Sea.
How many meters is one astronomical unit, as defined exactly by the IAU in 2012? Answer with the whole number only.
How many Space Shuttle orbiters flew in space? Answer with the whole number only.
What is the capital of Ghana? Answer with the city name only.
KLM is the flag carrier of Belgium. Answer true or false.
What is the highest mountain in South America? Answer with the name only.
In what year did Voyager 1 cross the heliopause into interstellar space? Answer with the four-digit year only.
The Airbus A380 has two full-length passenger decks. Answer true or false.
In what year did Montenegro declare independence? Answer with the four-digit year only.
In what year did Concorde enter commercial service? Answer with the four-digit year only.
How many letters long is an ICAO airline designator? Answer with the whole number only.
How many characters long is an IATA airline designator? Answer with the whole number only.
In what year did Yang Liwei become China's first astronaut in space? Answer with the four-digit year only.
How many up quarks does a proton contain? Answer with the whole number only.
The Large Hadron Collider ring is about how many kilometers in circumference? Answer with the whole number rounded to the nearest kilometer.
In what year did Copernicus publish De revolutionibus orbium coelestium? Answer with the four-digit year only.
In what year did Isaac Newton die? Answer with the four-digit year only.