In what year did Max Planck introduce the quantum of action? Answer with the four-digit year only.
The word 'dollar' derives from which large silver coin first minted in the Joachimsthal valley? Answer with the single word only, in lowercase.
Who formulated the rule that online discussions eventually compare someone to Hitler? Answer with the surname only.
Rounded down to a whole number, how many grams are in one troy ounce? Answer with the whole number only.
Which US senator inspired the 2021 'mittens' meme at the inauguration? Answer with the surname 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.
The mint mark 'P' stands for Denver. Answer true or false.