On Pi and Tau

In 2010, physicist and educator Michael Hartl published something he called The Tau Manifesto, a piece of writing which put forth arguments for a surprisingly controversial assertion: π is wrong.That's not to say that our measurements of it are off, of course; few things are more readily calculable than the ratio of a circle's circumference to its diameter. Instead, Hartl makes a compelling case for the idea that 2π, the ratio of a circle's circumference to its radius, is a far more fundamenta...