## Weekend Reading: Universe Sandbox, Mapping Math, and Japanese Companies

### 🌌 Universe Sandbox

This is a physics simulator that replicates the physics of interstellar objects. You can simulate massive planetary collisions or supernovae in the Earth’s solar system, in case you want to see what would happen.

### 🧮 The Map of Mathematics

A neat catalog “map” of mathematics, with visualizations of things like prime numbers, symmetry, calculus, and more. Quanta Magazine does fantastic work.

### 🇯🇵 Why So Many of the World’s Oldest Companies are in Japan

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