Physics Facts
The constants and units every other measurement rests on, and the ideas behind how they were fixed.
26 cryptograms, each one a fact written for this site rather than a sentence taken from a book. Cited to NIST and Royal Society of Chemistry.
How they are kept honest
Every claim names where it came from, and every source was read on the day it was cited, between 2026-08-27 and 2026-08-27. None of these claims can go out of date, which is why they were chosen.
- NIST25
- Royal Society of Chemistry1
How hard they are
0 easy, 18 medium and 8 hard, graded by the model described in our guide to solving cryptograms.
They average 73.9 letters over 19.7 distinct ones, with 4.4 letters appearing exactly once.
Every one of them
Each has a page of its own naming its source, and its answer on a separate page so you will not run into it by accident.
- NISTmedium, 75 letters
- NISTmedium, 71 letters
- NISTmedium, 72 letters
- NISThard, 75 letters
- NISTmedium, 72 letters
- NISTmedium, 71 letters
- NISTmedium, 72 letters
- NISTmedium, 74 letters
- NISTmedium, 75 letters
- NISThard, 74 letters
- NISTmedium, 76 letters
- NISThard, 75 letters
- NISTmedium, 74 letters
- NISTmedium, 79 letters
- NISTmedium, 72 letters
- NISThard, 74 letters
- NISTmedium, 77 letters
- NISThard, 73 letters
- NISTmedium, 77 letters
- NISTmedium, 73 letters
- NISTmedium, 73 letters
- NISTmedium, 75 letters
- NISThard, 77 letters
- NISThard, 74 letters
- NISThard, 74 letters
- Royal Society of Chemistrymedium, 68 letters