The clue "Physicist Niels" last appeared in the Wall Street Journal crossword on October 20, 2021. The correct answer for this puzzle is "BOHR", a 4-letter word.
Solution BOHR is 4 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is BOHR with 4 letters, and the shortest is BOHR with 4 letters.
Indeed, the puzzle clue "PHYSICIST NIELS" has seen a surge in lookups recently (last checked: 30 Nov 2025). Apparently it´s giving players some headaches!
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The solution is 4 letters long.