The Physical World

The foundations the standard story skips — on both sides. The non-Western roots: Babylonian place-value and astronomy, Egyptian geometry, India's zero and infinite series, China's empirical science and negative numbers, and the Islamic Golden Age that carried algebra, the algorithm, and the experimental method into the world. And the Greek roots this app's first draft wrongly dropped: Euclid's proof as the grammar of physics, Archimedes' statics and hydrostatics, the atomists, and Aristotle as the paradigm later overturned. By 1500 the ingredients Galileo inherited were in place — a synthesis of many traditions, not a European invention from nothing, and not a story with the Greeks written out of it either. Read critically: some transmission claims (Kerala calculus reaching Europe) are unproven, Lloyd's survey is sound but dated (1970), and Russo's Forgotten Revolution makes a genuinely contested case for how far Hellenistic science reached.

The foundation the rest of physics is built on, and the revolution that built it — every standard curriculum starts here, and the app's first draft skipped it. Galileo turning Aristotle's physics into experiment, Kepler's three laws, and Newton's Principia — motion, force, and universal gravitation made mathematical — then the reformulation by Lagrange and Hamilton, the least-action principle that all of modern physics still speaks in. Everything downstream — energy, entropy, fields, even the quantum — is defined here first. Weinberg's history is rich but openly judges the past by present physics, so read it as an opinionated physicist's take; Susskind's Theoretical Minimum is the one companion that asks you to do the calculus. And the unit carries motion to its modern conclusion — Einstein's relativity, which overturned Newton's absolute space and time. Carroll's Space, Time, and Motion develops it readably; and for the real thing, The Road to Relativity is the annotated Einstein, his own 1915 masterpiece in facsimile with page-by-page commentary — the Annotated Turing of general relativity, and a genuine stretch-read.

How we learned what matter is made of: Dalton's atoms, Avogadro's molecules, Mendeleev's periodic order — and then the atom coming apart, with Thomson's electron, Rutherford's nucleus, and Chadwick's neutron, on the eve of the quantum theory that would finally explain it. The chemistry that turns out to be the low-energy face of quantum mechanics.

Thermodynamics: the science that began with a practical question — how much work can you get from heat? — and ended up defining the arrow of time. Carnot, Joule, Clausius and Kelvin, then Boltzmann recasting entropy as counting, and Maxwell's demon quietly tying the second law to what an observer knows. This is where physics first touches the Information path. Rovelli's Order of Time is a lovely companion on entropy and the arrow of time, though its final third drifts into speculative quantum gravity — read it knowing where the science ends.

The invention of the field — the deepest idea in classical physics. From Franklin's single fluid and Volta's pile through Ørsted and Ampère to Faraday, who could not do the mathematics but saw the field, and Maxwell, who wrote it down and found light waiting inside his equations.

The longest argument in physics: is light a wave or a particle? Newton's corpuscles, Young and Fresnel's decisive waves, Maxwell's electromagnetic radiation — and then Planck and Einstein forcing the particle back in as the photon. Optics is where classical physics is at its most beautiful, and where it breaks. This is the place to finally read Einstein directly: Stachel's slim collection of the five 1905 papers, with the light-quantum paper beside Feynman's QED.

How the physics of matter became the information age. The electron is found (1897), understood inside solids by quantum mechanics, and then bent to human purposes in the transistor at Bell Labs in 1947 — the device that turns the whole curriculum's abstractions about information into something you can etch onto silicon by the billion.