Harvard and MIT just built an AI simulation containing 8.3 billion virtual people, roughly the entire population of Earth.
They call it MatrAIx.
It is a population-scale digital simulation infrastructure powered by frontier models like GPT and Claude.
They mapped out an insanely detailed dataset called Persona 8B. It contains 8.3 billion unique digital profiles.
Every single persona is defined across 1,290 categorical dimensions.
Backgrounds, psychology, spending habits, behavioral quirks, technical literacy, and lifestyle.
They didn't just build a database of stats. They brought them to life.
The researchers dropped these billion persona agents into four distinct digital environments:
• Surveys
• AI chat interfaces
• Live web browsing
• Native desktop and mobile apps
Then they tested how this digital Earth reacted to real-world products, software updates, and pricing shifts.
The system recorded everything: how long an agent hesitated after a price increase, when they abandoned a broken checkout flow, and how much latency they would tolerate before closing an app.
When researchers tested persona adherence, the AI agents successfully maintained their assigned psychological and demographic behavior 91.5% of the time.
Think about what this means for the future of business.
You no longer have to wait weeks for a market research firm to tell you if a product feature will fail.
You can simulate how 8 billion different types of humans will react to it in real time, overnight, on a single server.
“Our age of bronze is collapsing.”
“Oh no great Odysseus, what’s the cause?”
“Don’t be reductionist, Eurylochus. There’s no single cause. Persistent stressors on the palace economies, seismic activity, migration, disruption to the tin trade…”
Si en el Tratado de Alcáçovas Castilla se hubiese quedado con Cabo Verde en vez de Canarias, hoy nos habríamos ahorrado esta humillación.
Error estratégico garrafal de los Reyes Católicos.
So if you want to unalive yourself in the Harry Potter universe, do you just point the wand at your head/heart and Avada Kedavra or like will aiming at your big toe suffice?
no one currently living except for Jalen Brunson and George Bush know the feeling of being trained since childhood to fight and defeat your father’s archenemy and succeeding.