Prehistoric Calculus: Discovering Pi
Pi is mysterious. Sure, you “know” it’s about 3.14159 because you read it in some book. But what if you had no textbooks, no computers, and no calculus (egads!) — just your brain and a piece of paper. Could you find pi?
Archimedes found pi to 99.9% accuracy 2000 years ago — without decimal points or even the number zero! …Crowd Favorites
Math & Numbers
- Mental math shortcuts, adding 1-100
- Understanding exponents and the natural log
- Div, Curl, Flux, Gradient and other Vector Calculus topics
Programming & Web Development
- Site speedups with HTTP caching, gzip compression
- Understanding Rails, Web debugging, and Javascrtipt
- Swap bytes with XOR, byte order, unicode
