Einstein’s relativity formula says that matter contains energy equal to its mass multiplied by the square of the speed of light. Since the speed of light is enormous and its square is absolutely humongous. One kilogram of matter would release about 40% of the energy in the largest nuclear weapon ever exploded. It’s part of a package of equations that changed our view of space, time, matter, and gravity. Einstein’s relativity formula led us to radical new physics such as nuclear weapons, black holes, the Big Bang, GPS, etc.

## The Formula to Get 42 Billion Digits of π

While writing "7 Utterly Well-written Math Books About Pi," I found a very interesting math formula that will give you 42 consecutive digits of π accurately but is still wrong.