FACTUM
ARCHIVE / 2026

AN ARCHIVE OF IDEAS WORTH KNOWING.

One number. One idea.
Every one verified.

ARCHIVE — ALL / PARADOX / MATH / CHEMISTRY / PHYSICS / HUMAN / CODE / SPACE / NUMBERS / HISTORY17 ENTRIES

001
LIAR PARADOX
CLASS / PARADOX
002
0.999… = 1
CLASS / MATH
004
HILBERT'S HOTEL
CLASS / PARADOX
005
SELF-REFUTATION
CLASS / PARADOX
006
SHIP OF THESEUS
CLASS / PARADOX
009
MONTY HALL
CLASS / MATH
010
INFINITE ARITHMETIC
CLASS / MATH
023
BIRTHDAY PARADOX
CLASS / PARADOX
026
IRON
CLASS / CHEMISTRY
137
FINE-STRUCTURE CONSTANT
CLASS / PHYSICS
150
DUNBAR'S NUMBER
CLASS / HUMAN
404
MEANING NOT FOUND
CLASS / CODE
499
LIGHT DELAY
CLASS / SPACE
1729
HARDY–RAMANUJAN
CLASS / NUMBERS
1895
ALEPH-NULL
CLASS / MATH
1969
LO
CLASS / HISTORY
6174
KAPREKAR'S CONSTANT
CLASS / NUMBERS

INDEX — FULL CATALOG

001LIAR PARADOXPARADOX
0020.999… = 1MATH
004HILBERT'S HOTELPARADOX
005SELF-REFUTATIONPARADOX
006SHIP OF THESEUSPARADOX
009MONTY HALLMATH
010INFINITE ARITHMETICMATH
023BIRTHDAY PARADOXPARADOX
026IRONCHEMISTRY
137FINE-STRUCTURE CONSTANTPHYSICS
150DUNBAR'S NUMBERHUMAN
404MEANING NOT FOUNDCODE
499LIGHT DELAYSPACE
1729HARDY–RAMANUJANNUMBERS
1895ALEPH-NULLMATH
1969LOHISTORY
6174KAPREKAR'S CONSTANTNUMBERS

MANIFESTO

FACTUM is a numbered archive of ideas worth knowing.

One number. One idea. Every factual claim is verified. Every paradox is exactly what it claims to be.

IF IT ISN'T WORTH EXPLAINING, IT ISN'T WORTH ARCHIVING.

Every claim in the archive can be verified. Search the number. Read the sources. Don't trust the label — check it.