What do all the words below have in common?
But wait, don't stop there; rummage in the discards for the final answer to this puzzle, a three-word phrase.
Hint
How well do you know the notions of the world?
Hint
Not to be confused with a certain programming language, nor with a term from knitting.
Solution
Pearls! I've always associated pearls with oysters, but these ones were inside a mussel. They were less than 2 millimeters in diameter, alas, so this dinner did not pay for itself.
Congratulations to yesterday's solvers Anna K., Summer, Ronin, Ena, Bridget, Peter M., Jessica, Jacob C., Maddy, Kalpana, Inca, Dr. Hill, Graham, Kate, Dr. Yetman, and Mr. Gregg. Thanks to everybody who made a guess!
Ten years later, Dr. Shapiro revived Puzzle of the Day at Proof School, writing each day's puzzle on a name tag. After 600 puzzles or so, he was just starting to feel normal about students reading his chest all the time when campus closed and the puzzle, like the rest of our lives, moved online. New puzzles are posted daily on school days.
Want to catch up on old PotDs? There's an archive currently containing puzzles from March 2020 to March 2021.