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Hard topics, broken down to first principles. One a week.Latest: Issue 04 · Where Does the Energy Come From?
An interactive blog you play

Hard ideas, played until they're obvious.

Each week, one topic that usually takes a PhD gets stripped down to its fundamentals and rebuilt as a game. You guess first, then play with the real physics, then derive it yourself. By the end, you understand it from your own intuition instead of a definition.

Drag me
PhDFundamental
Jargon left: 12Keep simplifying.

Issues

Every issue is its own world: its own look, its own instruments, its own boss level.

How every issue plays

The same four moves, in this order, every week.

1 · Guess

Gut check

Answer a few questions before you know anything. Your guesses stay locked until the end.

"Can an arrow turn 0.37 times around a loop?"
2 · Play

Instruments

Sliders and canvases running the real equations. You build intuition by poking the physics until it pushes back.

Squeeze Earth until light can't escape.
3 · Derive

The math

Only now do the equations arrive, step by step, each one tied to something you already played with.

ρ + pᵣ = (b′ − 1) / 8πr₀² < 0
4 · Solve

Boss level

A real problem from the field. Then a debrief puts your first guesses next to the physics.

Mystery material: what is its Chern number?
Understanding you reach through your own intuition sticks. Facts you're handed don't.

Most explainers give you a surface-level picture and a metaphor. Simplify It goes further down, to the fundamental principle the whole topic rests on, and then makes you rediscover it.

The abstract parts, the ones you can't hold in your hand or easily picture, get an instrument you can poke. Every number on these pages comes from an actual calculation, not an animation of one.

In the lab

Planned issues. Vote for the one you want next (saved in your browser).