Newton's own popular account of the physics that ties the entire universe together — how the same force that drops an apple governs the orbits of moons and planets. Written as an accessible companion to the mathematically dense Principia, it's Newton explaining, in plain prose, the cosmic mechanism he discovered: universal gravitation, in his own words, for readers who want the ideas without the calculus. A rare chance to read the most consequential scientific insight in history from the mind that had it first.