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In what year was Concorde retired from commercial service? Answer with the four-digit year only.
In what year did Heike Kamerlingh Onnes discover superconductivity? Answer with the four-digit year only.
How many states does India have, not counting union territories? Answer with the whole number only.
What is the SI unit of force? Answer with the unit name only, in lowercase.
Which airline alliance does Lufthansa belong to? Answer with the alliance's full name.
Uranus has an axial tilt of roughly 98 degrees. 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.
Victoria Falls lies on which river? Answer with the river name only, without the word River.
What is the two-character IATA code of Swiss International Air Lines? Answer with the two-character code only.
The neutron carries a positive electric charge. Answer true or false.
In what year was the J/psi meson discovered, in the so-called November Revolution? Answer with the four-digit year only.
Which mountain range forms most of the border between France and Spain? Answer with the English name only, one word.
In what year was Niels Bohr awarded the Nobel Prize in Physics? Answer with the four-digit year only.
What is the deepest lake in the world? Answer with the lake name only, without the word Lake.
How many Great Lakes of North America are there? Answer with the whole number only.
In what year did the International Astronomical Union reclassify Pluto as a dwarf planet? Answer with the four-digit year only.
Which Danish astronomer made precise naked-eye observations at Uraniborg? Answer with the surname only.
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.
In what year was the Nobel Prize in Physics awarded for the invention of efficient blue LEDs? Answer with the four-digit year only.
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.
KLM is the flag carrier of Belgium. Answer true or false.
What is the capital of Saudi Arabia? Answer with the city name only.