Solved cryptogram
An electron weighs so little that about a billion billion billion of them make up one gram.
Physics Facts, sourced to NIST.
What it means
Written out, that is a one followed by twenty seven zeros. The number is hard to feel, so try it the other way around: if you could line up every electron in a single gram and count one a second, you would still be counting long after the sun had burned out. Almost all the mass of ordinary matter sits in the nucleus, and the electrons contribute a rounding error.
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This is not the kind of claim that goes out of date, which is why it was set as a puzzle rather than a fact with a shelf life.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 19 different ones, graded medium.
- SourceNIST
- CollectionPhysics Facts
- Difficultymedium
- Length74 letters, 19 of them different
Nearby in the collection
The facts either side of this one.
About as hard as this one
Scored closest to it by the model behind our guide to solving cryptograms.