Solved cryptogram
Quantum spin comes in halves and wholes of one small constant, and nothing lies in between.
Physics Facts, sourced to NIST.
What it means
Particles behave as though they carry angular momentum, but they cannot carry any arbitrary amount of it. The allowed values are whole or half multiples of the reduced Planck constant and nothing else. That split turns out to divide all matter in two: half-integer particles such as electrons refuse to share a state, which is why atoms have structure and why solid objects hold their shape.
The claim comes from NIST, and the page it comes from was read on 2026-08-27 to confirm it still says this.
This is not the kind of claim that goes out of date, which is why it was set as a puzzle rather than a fact with a shelf life.
Solve it yourself
This fact is a cryptogram here: 74 letters over 20 different ones, graded hard.
- SourceNIST
- CollectionPhysics Facts
- Difficultyhard
- Length74 letters, 20 of them different
Nearby in the collection
The facts either side of this one.
- NISTmedium, 75 letters
- NISThard, 77 letters
- NISThard, 74 letters
- Royal Society of Chemistrymedium, 68 letters
About as hard as this one
Scored closest to it by the model behind our guide to solving cryptograms.