Logic Of The Spheres

The Volume of a Sphere - Numberphile

But why is a sphere's surface area four times its shadow?

Non-Euclidean Worlds Engine

The paradox at the heart of mathematics: Gödel's Incompleteness Theorem - Marcus du Sautoy

Getting Started with UA Sphere Modeling Microphones

I Invented The Logic-Powered SPHERE-COPTER [Trailmakers]