Biology Facts
How a living body works, from the four letter code that builds it to the organ you are wearing.
31 cryptograms, each one a fact written for this site rather than a sentence taken from a book. Cited to 15 sources, NCBI Bookshelf the most common.
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. 1 of them can change over time and carry a date by which somebody should check them again; the rest cannot.
- NCBI Bookshelf5
- MedlinePlus4
- National Human Genome Research Institute4
- NIDCD3
- Royal Society of Chemistry3
- National Eye Institute2
- NHLBI2
- Brain Research Bulletin1
- Frontiers in Psychology1
- NIAMS1
- NIDDK1
- NIGMS1
- PLOS Biology1
- PNAS1
- U.S. Geological Survey1
How hard they are
7 easy, 15 medium and 9 hard, graded by the model described in our guide to solving cryptograms.
They average 72.9 letters over 19.1 distinct ones, with 3.5 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.
- Royal Society of Chemistrymedium, 71 letters
- Royal Society of Chemistryhard, 70 letters
- Royal Society of Chemistrymedium, 78 letters
- U.S. Geological Surveyhard, 66 letters
- National Eye Institutemedium, 73 letters
- National Eye Institutemedium, 72 letters
- NIDCDmedium, 68 letters
- NIDCDhard, 74 letters
- NIDCDeasy, 74 letters
- NIDDKhard, 74 letters
- NHLBImedium, 74 letters
- NHLBIhard, 75 letters
- MedlinePluseasy, 72 letters
- MedlinePlushard, 76 letters
- NCBI Bookshelfeasy, 75 letters
- NCBI Bookshelfeasy, 77 letters
- NIGMSmedium, 76 letters
- National Human Genome Research Institutemedium, 74 letters
- National Human Genome Research Institutehard, 67 letters
- National Human Genome Research Institutehard, 67 letters
- National Human Genome Research Instituteeasy, 77 letters
- NCBI Bookshelfmedium, 79 letters
- NCBI Bookshelfeasy, 71 letters
- PLOS Biologymedium, 75 letters
- NIAMShard, 76 letters
- NCBI Bookshelfmedium, 77 letters
- MedlinePlusmedium, 69 letters
- MedlinePlusmedium, 68 letters
- Frontiers in Psychologymedium, 68 letters
- PNASmedium, 72 letters
- Brain Research Bulletineasy, 74 letters