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In what year did US Airways Flight 1549 land on the Hudson River? Answer with the four-digit year only.
Gamma rays have a higher frequency than radio waves. Answer true or false.
How many hexagonal segments make up the James Webb Space Telescope's primary mirror? 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 Nobel Prize in Physics awarded for the invention of efficient blue LEDs? 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.
Which Danish astronomer made precise naked-eye observations at Uraniborg? Answer with the surname only.
How many emirates make up the United Arab Emirates? Answer with the whole number only.
What is the capital of the US state of Pennsylvania? Answer with the city name only.
In what year was Space Shuttle Columbia lost during re-entry? Answer with the four-digit year only.
What is the SI unit of electrical resistance? Answer with the unit name only, in lowercase.
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.
What is the largest moon in the Solar System? Answer with the name only.
How many meters is one astronomical unit, as defined exactly by the IAU in 2012? Answer with the whole number only.
How many Space Shuttle orbiters flew in space? Answer with the whole number only.
What is the capital of Ghana? Answer with the city name only.
In what year was the Three Mile Island nuclear accident? Answer with the four-digit year only.
Light travels faster in water than in a vacuum. Answer true or false.
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.
The Airbus A380 has two full-length passenger decks. Answer true or false.
KLM is the flag carrier of Belgium. Answer true or false.
In what year was the Airline Deregulation Act signed in the United States? Answer with the four-digit year only.
In what year did Henri Becquerel discover radioactivity? Answer with the four-digit year only.