the things we still don't understand
The deepest things we don't yet understand.
A standing catalog of the hardest open questions — across the brain, the cell, the origin of life, physics, cosmology, mind, meaning, and AI. Not a list of answers. A map of where human knowledge still runs out.
A running catalog · the questions worth returning to
The questions
The Brain
How does the brain physically store a single memory — and where does it actually live?
When I recall my favorite restaurant and re-feel the meal, what is actually happening — from the physics to the chemistry to the biology to my conscious experience?
What is the neural code — how does a pattern of voltage spikes become a thought?
How does the brain bind millions of separate signals into one unified moment of experience?
How does general anesthesia switch consciousness off — what is it turning off?
What is sleep for, at the cellular level — why does every animal risk it?
How does one fertilized cell wire 86 billion neurons into a working brain?
The Cell
How does one genome build a specific 3D body — what tells cells where to stop?
How does a protein fold itself, correctly, in milliseconds, every time?
How does a single cell decide to grow, divide, or die?
What is cancer, fundamentally — a genetic accident, or a cell reverting to an ancient program?
How does the immune system tell "you" from "not you"?
Why do we age — programmed decay, or accumulated damage?
The Origin of Life
How did dead chemistry first become a living thing that copies itself?
Where did the genetic code come from — why these letters for these amino acids?
Why is all life left-handed when both mirror-forms are chemically equal?
Physics
How do you fit gravity and quantum mechanics into one theory?
What actually happens when a quantum measurement "collapses" reality?
What is dark matter — the invisible 85% of all the mass there is?
What is dark energy — the thing tearing the universe apart faster every year?
Why is there matter at all — where did the antimatter go?
What's inside a black hole, and where does the information go when it dies?
How does high-temperature superconductivity actually work?
Cosmology
What happened in the first instant — and what, if anything, came before?
Why are the constants of nature tuned so finely for a universe that can hold structure?
Are we alone — how common is life out there?
Math & Computation
Is finding an answer as easy as checking one?
Are the prime numbers secretly ordered?
Do the equations of fluid flow always behave, or can they blow up?
Chemistry & Complexity
Why does water break nearly every rule a liquid should follow?
Can we predict a molecule's behavior from first principles alone?
Why does turbulence resist all prediction — the last unsolved problem of classical physics?
Mind
Is consciousness real authorship, or evolution's illusion of agency?
Can something understand without experiencing anything — and does the mechanism matter?
Is consciousness formalizable — could there ever be a "consciousness theorem"?
Knowledge & Progress
What makes one explanation better than another?
Is every problem soluble given enough knowledge, or are some permanently closed?
How do you build a verifier for truth that can't be gamed?
Are we limited more by missing answers, or by the flood of confident wrong ones?
Free Will & Self
If we're mechanistic with no libertarian free will, what should we actually do about it?
How much can a person genuinely change who they are?
Meaning & Value
Where does meaning come from once work disappears — and can it scale past the 0.01%?
How do you replace an old meaning structure without leaving a dangerous vacuum?
What's the right amount of hardship to build character without breaking the person?
Future & AI
Where's the line between Functional and Technical AGI — and which one decides the future?
What will be the first unmistakable signs of AGI?
Will AI become a successor, a partner, or a tool — and which should we want?
Frontier
What is intelligence for at cosmic scale — is the point to beat entropy?
Can identity survive digital transfer — is "not dying" even coherent?
Why is there something rather than nothing?