The solution to the puzzle canon I posted on Feb 12, which is based on the theme of Bach's work The Musical Offering.

An original puzzle canon in honor of Gödel, Escher, Bach author Douglas Hofstadter's birthday. Can you solve it? Answer posted on Bach's birthday, March 31.

In the best-selling business book Good to Great, Jim Collins analyzes companies that have turned from average to superstars, and found that dogged adherence to a simple well-chosen strategy wins the race. Here's why.

Math education is a leaky boat that is engulfed in flames and sailing in the wrong direction. There is so much wrong that it is hard to know where to start. And fixing just one problem won't save the ship...

I love math. I hate the way it is taught. If you feel similarly, and want to do something about, then this manifesto is for you.

Ambigrams are words that read in more than one way — like WOW, which is MOM upside down. Only a few words are natural ambigrams, but if you stretch the letter shapes, almost any word can become an ambigram.