Read by Sam Altman
All 8 Gravity Books
- The Principia: Mathematical Principles of Natural Philosophy
- The Meaning of Relativity
- Naturwissenschaftliche Volksbücher
- The System of the World
- Philosophiæ Naturalis Principia Mathematica
- Relativity: The Special and the General Theory
- Black Holes: The Key to Understanding the Universe
- Merlin's Tour of the Universe