This page is a kind of catch-all for things I find interesting. May not be exactly related to mathematics....
Surprising result: What is the volume remaining in a sphere with a hole drilled through it?
Are you impressed by savants who can recall the day of the week on any given date in history? Well don't be, anyone can do it. Here's how.
I wrote a step-by-step method for the 4x4x4 Rubik's Cube.