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In what year did Concorde enter commercial service? Answer with the four-digit year only.
In what year did Montenegro declare independence? Answer with the four-digit year only.
How many characters long is an IATA airline designator? Answer with the whole number only.
How many letters long is an ICAO 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 was Neptune discovered? Answer with the four-digit year only.
The Sun is a red dwarf star. Answer true or false.
What is the SI base unit of thermodynamic temperature? Answer with the unit name only, in lowercase.
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 James Clerk Maxwell publish 'A Dynamical Theory of the Electromagnetic Field'? Answer with the four-digit year only.
How many territories does Canada have? Answer with the whole number only.
What is the two-character IATA code of Norwegian Air Shuttle? Answer with the two-character code only.
In which country is Machu Picchu? Answer with the country name only.
In what year was Emirates airline founded? Answer with the four-digit year only.
In what year was Etihad Airways founded? Answer with the four-digit year only.
In what year was Aeroflot founded? Answer with the four-digit year only.
In what year did Hawaii become a US state? Answer with the four-digit year only.
In what year did Paul Dirac publish his relativistic equation for the electron? Answer with the four-digit year only.
How many dwarf planets does the International Astronomical Union officially recognize? Answer with the whole number only.
What is the exact defined speed of light in vacuum, in meters per second? Answer with the whole number only.
In what year was Zarya, the first module of the International Space Station, launched? Answer with the four-digit year only.
Venus is the hottest planet in the Solar System. Answer true or false.
In what year did the Chelyabinsk meteor explode over Russia? Answer with the four-digit year only.