Photons, wave–particle duality, and why atoms don't collapse — the strangest (and most successful) theory in physics, explained from zero.
No calculus required. If you can rearrange E = hf, you can follow every module.
One idea per module, in the order physics itself discovered them — from glowing hot metal to the quantum atom. Each module is a written tutorial with analogies, worked numeric examples (algebra only), and an exercise with solutions.
The story continues into the truly strange territory — uncertainty, superposition, entanglement — and ends at the door of quantum computing. Same format, same beginner-friendly level.
This is a conceptual introduction to quantum physics for curious beginners — students, developers, and anyone who has heard “superposition” or “entanglement” and wants to actually understand what those words mean. The only prerequisite is basic algebra: we use real equations like E = hf and λ = h/p and plug real numbers into them, but there is no calculus anywhere. Every module follows the same rhythm: see the puzzle that broke classical physics, learn the quantum idea that solved it in plain English, work a numeric example, then test yourself with an exercise and its solution. The course follows the historical order of discovery, because that's the order in which each idea makes sense.