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How many sovereign countries are there in South America? Answer with the whole number 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.
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.
In what year was the Nobel Prize in Physics awarded for the invention of efficient blue LEDs? Answer with the four-digit year only.
Light travels faster in water than in a vacuum. Answer true or false.
What is the SI base unit of amount of substance? Answer with the unit name only, in lowercase.
What is the capital of the US state of Pennsylvania? Answer with the city name only.
What is the largest country in Africa by area? Answer with the country name only.
Which sea lies between Italy and the Balkan Peninsula? Answer with the sea name only, without the word Sea.
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.
How many Space Shuttle orbiters flew in space? Answer with the whole number only.
What is the highest mountain in South America? Answer with the name only.
Gamma rays have a higher frequency than radio waves. Answer true or false.
KLM is the flag carrier of Belgium. Answer true or false.
What is the capital of Saudi Arabia? Answer with the city name only.
In what year was Space Shuttle Columbia lost during re-entry? 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 which country is the city of Timbuktu? Answer with the country name 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.
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.