Why Soap Bubbles Are Round and Foam Walls Meet at 120 Degrees: The Physics of Surface Tension and Plateau's Laws
Why the Reuleaux Triangle Can Drill a Square Hole: Curves of Constant Width and the Geometry of Barbier's Theorem
How to Enclose the Largest Area with a String of Fixed Length? The Isoperimetric Problem and Shape Optimization
Gauss's Theorema Egregium - A Monumental Milestone in Differential Geometry That Can Also Be Applied to How You Eat Pizza