Skip to main content

Physics, explained from first principles.

Free, open courses for curious minds. No accounts, no paywalls — just the universe and the ideas that describe it.

I want to understand…

what matter is made of topicNewton's laws from scratch coming soonwhat the Standard Model actually says topichow quantum mechanics works coming soon

📓 Read the Journal — thoughts on physics, pedagogy, and the road ahead.

Full Courses

Deep dives — start at chapter 1, build understanding page by page.

AstrophysicsBeginner

Introduction to Astrophysics

Stars, galaxies, the expanding universe, and Big Bang nucleosynthesis — a first tour of the cosmos.

Coming soon
Classical MechanicsBeginner

Introduction to Classical Mechanics

Newton's laws, energy, momentum, and the principle of stationary action — from first principles.

Coming soon
Quantum MechanicsBeginner

Introduction to Quantum Mechanics

Wave functions, quantisation, and the measurement problem — quantum mechanics from the ground up.

Coming soon
Browse all courses →

Topics

Focused explorations — one subject, 30 to 90 minutes.

Particle Physics

The Standard Model

The twelve fundamental particles and three Standard-Model interactions – with gravity discussed as the force beyond its reach – told in one focused session.

~45 minExplore →
Browse all topics →

Snippets

Quick reads — one concept, under 15 minutes.

Thermodynamics

What is temperature?

~10 min
Browse all snippets →