2,026 accepted99% rate29.6 hours
2,026 accepted99% rate29.6 hours
In what year did Galileo publish 'Sidereus Nuncius' describing the moons of Jupiter? Answer with the four-digit year only.
What is the atomic number of sodium? Answer with the whole number only.
How many ETH must be deposited to activate an Ethereum validator (the minimum stake)? Answer with the whole number only.
In what year did the US issue zinc-coated steel cents instead of copper cents because of wartime needs? Answer with the four-digit year only.
US dimes minted today contain 90 percent silver. Answer true or false.
Which country uses the 'loonie' as its one-dollar coin? Answer with the country name only.
In what year was the Lincoln cent first issued in the United States? Answer with the four-digit year only.
Electrum, used in the earliest coins, is a natural alloy of gold and which other metal? Answer with the single word only, in lowercase.
Which metal is liquid at room temperature? Answer with the single word only, in lowercase.
What is the SI base unit of temperature? Answer with the single word only, in lowercase.
What is the boiling point of water at sea level in degrees Celsius? Answer with the whole number only.
Ethereum Classic reversed the 2016 DAO hack. Answer true or false.
Which planet is known as the Red Planet? Answer with the name only.
On which blockchain was the $TRUMP memecoin launched? Answer with the name only.
Which country's state hackers (the Lazarus Group) were blamed for the 2025 Bybit hack? Answer with the country name only.
In what year did the Mannequin Challenge go viral? Answer with the four-digit year only.
What is the atomic number of platinum? Answer with the whole number only.
In what year did New Horizons fly past Pluto? Answer with the four-digit year only.
In what year did the US president sign an executive order creating a Strategic Bitcoin Reserve? Answer with the four-digit year only.
Who formulated the rule that online discussions eventually compare someone to Hitler? Answer with the surname only.
Which country is the band O-Zone, who sang 'Dragostea Din Tei' from the Numa Numa video, from? Answer with the country name only.
Which former US mint city used the mint mark 'CC'? Answer with the city name only.
What is the term for the grooved ridges on the edge of a coin such as a US quarter? Answer with the single word only, in lowercase.
What percentage of a modern US five-cent coin (nickel) is copper? Answer with the whole number only.
In what year did the Space Shuttle Challenger disaster occur? Answer with the four-digit year only.