◌ ONE ORIGIN The story · Shifting the frame

♾️ SHIFTING THE FRAME · EXPONENTIAL LINEAGE

The Great-Grandparent Multiplier

The tool calculates backward generation by generation — parents, grandparents, great-grandparents. It quickly reveals the paradox: your theoretical ancestor count overtakes the entire living population, proving human family trees do not branch infinitely. They loop and intertwine, meaning everyone on Earth shares the same historical ancestors.

A golden-hour plaza crowd whose shadows branch into a tree-like pattern.
The branches you count are branches you share.
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Hover or tap the chart to read any generation.

Population anchors are order-of-magnitude from the standard McEvedy & Jones / HYDE-shaped curve; the crossing is robust to large error. See also Rohde, Olson & Chang, Nature 431 (2004), and Chang 1999 on the identical-ancestors point.

More ways we’re connected

Sixteen ways to put the same point — that every human line on Earth runs back to one place — in your own hands.

Your own numbers

Your birthday crowdA date you share with millions. Your family treeMore branches. Shared roots. Your place, real sizeA fairer view of somewhere you love. A moment we shareDifferent clocks. Happening together.

The deep record

Two chains, one continentMitochondrial Eve and Y-chromosomal Adam, drawn against time. The shared ancestor counterType a crowd. Find the ancestor every one of them shares. Count the hands between usFewer than 50 links separate any two people alive. Fourteen peoples, one patternStructural universals across five continents.

Shifting the frame

Footsteps of KinshipDrag 300,000 years of leaving Africa, one toolkit at a time. Root to BranchThousands of languages branching from African roots. The Deep Time MirrorYour face, aligned with the oldest skulls we have. The Deep History Time MachineWatch borders, cities and farms fade off the planet. The Great-Grandparent MultiplierYour family tree has to loop. Here is the maths. Stardust & SoilWhat you are made of, and where each atom was forged. The Borderless Night SkySame stars. Many skies. One imagination. The Reverse Migration PostcardA line from your city back to the Great Rift Valley.

Feel the pattern

The Converging RiversEvery river runs back to the Rift. Drag to pull a thread home. The Synchronized BreathOne atmosphere. Hold to slow and breathe with the globe. The Shared LexiconMama, water, fire: one breath, many scripts. The Erasure of BordersScroll to peel the modern map down to a starlit Africa. The Mirror of AgesMany shades, one composite face. Unify the spectrum.

What every human does

Everybody SingsMusic was in all 315 societies the census read. All of them. The Same FaceBorn blind, never seen a face — and the same smile on winning. Two Hundred MillisecondsTen languages, five continents, one fifth of a second.