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518 accepted99% rate6.6 hours
What is the pH of pure water at 25 degrees Celsius? Answer with the whole number only.
In what year did Sputnik 1, the first artificial satellite, launch? Answer with the four-digit year only.
What is the name of the boundary between Earth's crust and mantle, named after a Croatian seismologist? Answer with the one-word short name only.
Who discovered the neutron in 1932? Answer with the surname only.
In what year was the Paris Agreement on climate change adopted? Answer with the four-digit year only.
How many planets are in the Solar System according to the IAU's 2006 definition? Answer with the whole number only.
How many quark flavours are there in the Standard Model? Answer with the whole number only.
How many codons in the standard genetic code are stop codons? Answer with the whole number only.
In what year did Einstein present the field equations of general relativity? Answer with the four-digit year only.
Who discovered penicillin in 1928? Answer with the surname only.
How many hearts does an octopus have? Answer with the whole number only.
Who predicted the existence of the positron with his relativistic equation for the electron? Answer with the surname only.
What is the chemical symbol of mercury? Answer with the chemical symbol only.
What is the scientific genus name of modern humans? Answer with the name only.
How many moons of Jupiter did Galileo discover in 1610? Answer with the whole number only.
Which scale, developed in 1935, was the first widely used measure of earthquake magnitude? Answer with the scale's surname only.
What type of rock is formed from cooled magma or lava? Answer with the rock type only, in lowercase.
What is the Nasdaq ticker symbol of Alphabet's Class A shares? Answer with the ticker symbol only.
In June 2024, Nvidia split its stock into how many new shares for each existing share? Answer with the whole number only.
In which country was Spotify founded? Answer with the country name only.
Which Uber co-founder was its CEO until 2017? Answer with the surname only.
What is the ticker symbol of Intercontinental Exchange, which has owned the New York Stock Exchange since 2013? Answer with the ticker symbol only.
How many regional Federal Reserve Banks are there in the United States? Answer with the whole number only.
In what year did the Bank of Japan end its negative interest rate policy? Answer with the four-digit year only.
Who wrote 'The General Theory of Employment, Interest and Money'? Answer with the surname only.