While presenting “Reporting and Analyzing PPC Campaigns” at SES New York last month, I noticed that many participants were interested in learning more about how to meticulously analyze campaign ...

Like math? Like puzzles? Then meet Bojagi, a game created by David Radcliffe (@daveinstpaul). It looks simple enough. A grid has a few numbers in it. The goal is to draw a rectangle around each number ...

Using high school algebra and geometry, and knowing just one rational point on a circle or elliptic curve, we can locate infinitely many others. You’re sitting at the end of a long conference table, ...