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1,200 accepted98% rate18.2 hours
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.
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 Voyager 1 cross the heliopause into interstellar space? Answer with the four-digit year only.
KLM is the flag carrier of Belgium. Answer true or false.
What is the capital of Saudi Arabia? Answer with the city name only.
How many characters long is an IATA airline designator? Answer with the whole number only.
How many up quarks does a proton contain? Answer with the whole number only.
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.
The Boeing 747 has three engines. Answer true or false.
In what year did Stephen Hawking publish his prediction that black holes emit radiation, in Nature? Answer with the four-digit year only.
In what year did Isaac Newton publish Opticks? Answer with the four-digit year only.
What is the capital of Cuba? Answer with the English name of the city only.
In which country is Machu Picchu? Answer with the country name only.
In what year did fragments of Comet Shoemaker-Levy 9 hit Jupiter? Answer with the four-digit year only.
How many US states border Mexico? Answer with the whole number only.
How many countries share a land border with China? Answer with the whole number only.
In what year did Paul Dirac publish his relativistic equation for the electron? Answer with the four-digit year only.
Greenland is part of the Kingdom of Denmark. Answer true or false.
In what year did Alaska Air Group complete its acquisition of Hawaiian Airlines? 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 two-character IATA code of KLM? Answer with the two-character code only.
What is the capital of Pakistan? Answer with the city name only.