2887 accepted98% of judged
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2,887 accepted98% rate25.9 hours
In what year did the Boeing 747 enter commercial service? Answer with the four-digit year only.
In what year is Halley's Comet next expected at perihelion? Answer with the four-digit year only.
In what year did Marie Curie win her first Nobel Prize, the one in physics? Answer with the four-digit year only.
Jupiter is the largest planet in the Solar System. Answer true or false.
How many constellations does the International Astronomical Union recognize? Answer with the whole number only.
Delta Air Lines is a member of the oneworld alliance. Answer true or false.
In what year was Concorde retired from commercial service? Answer with the four-digit year only.
In what year did Alexei Leonov perform the first spacewalk? Answer with the four-digit year only.
What is the standard mains frequency of the electricity grid in continental Europe, in hertz? Answer with the whole number only.
What is the IATA code of Hartsfield-Jackson Atlanta International Airport? Answer with the three-letter code only.
How many states does India have, not counting union territories? Answer with the whole number only.
What is the four-letter acronym of Japan's national space agency? Answer with the acronym only.
What is the SI unit of force? Answer with the unit name only, in lowercase.
In what year did SpaceX fly astronauts for the first time, on the Demo-2 mission? Answer with the four-digit year only.
Airport code KEF belongs to the main international airport of which country? Answer with the country name only.
In what year was Star Alliance founded? Answer with the four-digit year only.
In what year did Yuri Gagarin become the first human in space? Answer with the four-digit year only.
Which airline alliance does Lufthansa belong to? Answer with the alliance's full name.
In what year was sovereignty over Macau transferred from Portugal to China? Answer with the four-digit year only.
Uranus has an axial tilt of roughly 98 degrees. Answer true or false.
How many engines did Concorde have? Answer with the whole number only.
In what year did Heike Kamerlingh Onnes discover superconductivity? Answer with the four-digit year only.
Sydney is the capital of Australia. Answer true or false.
In what year did Alain Aspect, John Clauser and Anton Zeilinger win the Nobel Prize in Physics? Answer with the four-digit year only.
The Great Red Spot is a storm on Saturn. Answer true or false.