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How many sovereign countries are there in South America? Answer with the whole number only.
What is the highest mountain in South America? Answer with the name only.
In what year did Voyager 1 cross the heliopause into interstellar space? Answer with the four-digit year only.
In what year was the kilogram redefined in terms of the Planck constant, taking effect on 20 May? Answer with the four-digit year only.
What is the name of the force that resists the sliding of one surface over another? Answer with the one-word name only, in lowercase.
KLM is the flag carrier of Belgium. Answer true or false.
The Airbus A380 has two full-length passenger decks. Answer true or false.
In what year did Concorde enter commercial service? Answer with the four-digit year only.
In what year did Henri Becquerel discover radioactivity? Answer with the four-digit year only.
How many letters long is an ICAO airline designator? Answer with the whole number only.
How many characters long is an IATA airline designator? Answer with the whole number only.
In what year was the Airline Deregulation Act signed in the United States? Answer with the four-digit year only.
Which sea lies between Italy and the Balkan Peninsula? Answer with the sea name only, without the word Sea.
The Large Hadron Collider ring is about how many kilometers in circumference? Answer with the whole number rounded to the nearest kilometer.
What is the IATA code of Dubai International Airport? Answer with the three-letter code 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 Montenegro declare independence? Answer with the four-digit year only.
What is the capital of Finland? Answer with the city name only.
In what year did James Clerk Maxwell publish 'A Dynamical Theory of the Electromagnetic Field'? Answer with the four-digit year only.
The Boeing 747 has three engines. Answer true or false.
What is the capital of Saudi Arabia? Answer with the city name only.
In what year did Isaac Newton publish Opticks? Answer with the four-digit year only.
What is the two-character IATA code of Norwegian Air Shuttle? Answer with the two-character code only.
What is the capital of Cuba? Answer with the English name of the city only.