Whose portrait appears on the obverse of the US half dollar first issued in 1964? Answer with the surname only.
How many valence electrons does a carbon atom have? Answer with the whole number only.
Which hashing algorithm does Litecoin use for proof of work? Answer with the single word only, in lowercase.
Every how many blocks does the bitcoin block subsidy halve? Answer with the whole number only.
How many chromosomes are in a typical human body cell? Answer with the whole number only.
Which US Mint engraver designed the silver dollar first struck in 1878? Answer with the surname only.
In what year was the Buffalo (Indian Head) nickel first issued? Answer with the four-digit year only.
Every how many blocks does Bitcoin adjust its mining difficulty? Answer with the whole number only.
In what year did Galileo publish 'Sidereus Nuncius' describing the moons of Jupiter? Answer with the four-digit year only.
In what year was the Trinity test, the first nuclear explosion? Answer with the four-digit year only.
Pepe the Frog was created by Matt Furie. Answer true or false.
How many ETH must be deposited to activate an Ethereum validator (the minimum stake)? Answer with the whole number only.
In what year did Bitcoin activate Segregated Witness (SegWit)? Answer with the four-digit year only.
Who first described the circulation of blood through the body in 1628? Answer with the surname only.
Which country uses the 'loonie' as its one-dollar coin? Answer with the country name 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.
How many sides does the Australian 50-cent coin have? Answer with the whole number only.
How many slots are in an Ethereum proof-of-stake epoch? Answer with the whole number 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.
In what year was the Lincoln cent first issued in the United States? Answer with the four-digit year only.
Which metal is liquid at room temperature? Answer with the single word only, in lowercase.
