1,066 accepted98% rate17.0 hours
1,066 accepted98% rate17.0 hours
In what year did Fermilab announce the discovery of the top quark? Answer with the four-digit year only.
In what year did the de Havilland Comet begin the world's first scheduled jet airliner service? Answer with the four-digit year only.
In what year did the Boeing 747 enter commercial service? Answer with the four-digit year only.
In what year was the Chernobyl nuclear accident? Answer with the four-digit year only.
Bolivia is landlocked. Answer true or false.
In what year did Heike Kamerlingh Onnes discover superconductivity? 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.
In what year did Alexei Leonov perform the first spacewalk? Answer with the four-digit year only.
In what year did the Airbus A320 enter commercial service? Answer with the four-digit year only.
In what year did SpaceX fly astronauts for the first time, on the Demo-2 mission? Answer with the four-digit year only.
What is the SI unit of force? Answer with the unit name only, in lowercase.
In what year did Pan American World Airways cease operations? Answer with the four-digit year only.
Which airline alliance does Lufthansa belong to? Answer with the alliance's full name.
In what year did Air Berlin cease operations? Answer with the four-digit year only.
Uranus has an axial tilt of roughly 98 degrees. Answer true or false.
Who commanded Apollo 13? Answer with the surname only.
How many engines did Concorde have? Answer with the whole number only.
The Great Red Spot is a storm on Saturn. Answer true or false.
Which European country occupies most of the Jutland peninsula? Answer with the country name only.
Who discovered radioactivity in 1896? Answer with the surname only.
What is the capital of Australia? Answer with the city name only.
In what year did Kazakhstan move its capital from Almaty to Astana? Answer with the four-digit year only.
What is the capital of Norway? Answer with the city name only.
In what year did LIGO record GW150914, the first direct detection of gravitational waves? Answer with the four-digit year only.
Norway is a member of the European Union. Answer true or false.