This is an excerpt from The Gravity of Math: How Geometry Rules the Universe by Steve Nadis and Shing-Tung Yau. Skip to content Introducing the all-new Astronomy.com Forum!

A woman found a math textbook dating back to 1813. ... Michelle Manning was cleaning out her stepfather’s attic when she came across a book titled Principles of Geometry.

As a high school sophomore in the 1960s, I was struggling with geometry, then being badly taught according to the notoriously ill-conceived system known as the New Math. In despair over one D-plus ...