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Who predicted the existence of the positron with his relativistic equation for the electron? Answer with the surname only.
Which founder of Blue Origin also founded Amazon? Answer with the surname only.
In what year did the Tunguska event flatten forest in Siberia? Answer with the four-digit year only.
Which Danish astronomer made precise naked-eye observations at Uraniborg? Answer with the surname only.
What is the SI base unit of amount of substance? Answer with the unit name only, in lowercase.
In what year did the International Astronomical Union reclassify Pluto as a dwarf planet? Answer with the four-digit year only.
How many neutrons are in the nucleus of carbon-12? Answer with the whole number only.
What is the largest country in Africa by area? Answer with the country name 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.
Gamma rays have a higher frequency than radio waves. Answer true or false.
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.
What is the capital of the US state of Pennsylvania? Answer with the city name only.
Light travels faster in water than in a vacuum. Answer true or false.
How many emirates make up the United Arab Emirates? Answer with the whole number only.
In what year was the Three Mile Island nuclear accident? Answer with the four-digit year only.
What is the largest moon in the Solar System? Answer with the name only.
What is the capital of Finland? Answer with the city name only.
How many Space Shuttle orbiters flew in space? Answer with the whole number only.
In what year did Henri Becquerel discover radioactivity? Answer with the four-digit year only.
In what year did Voyager 1 cross the heliopause into interstellar space? Answer with the four-digit year only.
The Airbus A380 has two full-length passenger decks. Answer true or false.
In what year did Montenegro declare independence? Answer with the four-digit year only.
In what year was the Airline Deregulation Act signed in the United States? Answer with the four-digit year only.
How many characters long is an IATA airline designator? Answer with the whole number only.
In which country is the city of Timbuktu? Answer with the country name only.