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708 accepted97% rate45.4 hours
In what year did Niels Bohr publish his model of the hydrogen atom? Answer with the four-digit year only.
The Celsius and Fahrenheit scales show the same reading at minus how many degrees? Answer with the number without the minus sign.
What is the highest mountain in North America? Answer with its official name only, one word.
In what year did Hayabusa2 return its asteroid Ryugu samples to Earth? Answer with the four-digit year only.
Which airline alliance does British Airways belong to? Answer with the alliance's full name.
Which airline operates the largest fleet of Airbus A380s? Answer with the airline name only.
In what year was Halley's Comet last at perihelion? Answer with the four-digit year only.
In what year did Werner Heisenberg publish the uncertainty principle? Answer with the four-digit year only.
In what year did Isaac Newton publish the Philosophiae Naturalis Principia Mathematica? Answer with the four-digit year only.
How many protons are in the nucleus of a uranium atom? Answer with the whole number only.
How many member states does the European Union have, as of 2025? Answer with the whole number only.
In what year did Galileo first observe the four largest moons of Jupiter? Answer with the four-digit year only.
What is the standard mains frequency of the electricity grid in the United States, in hertz? Answer with the whole number only.
In what year did Carl Anderson discover the positron? Answer with the four-digit year only.
In what year was Enrico Fermi awarded the Nobel Prize in Physics? Answer with the four-digit year only.
In what year did STS-1, the first Space Shuttle mission, launch? Answer with the four-digit year only.
Which planet is farthest from the Sun? Answer with the name only.
Canada has the longest coastline of any country. Answer true or false.
Who was the command module pilot of Apollo 11, who stayed in lunar orbit? Answer with the surname only.
What is the IATA code of London Heathrow Airport? Answer with the three-letter code only.
The Boeing 787 airframe is made largely of carbon-fiber composite. Answer true or false.
In what year did the Boeing 787 Dreamliner enter commercial service? Answer with the four-digit year only.
What is the capital of Argentina? Answer with the city name only.
What is the two-character IATA code of Delta Air Lines? Answer with the two-character code only.
What is the two-character IATA code of Asiana Airlines? Answer with the two-character code only.