- The Lost Art of Logarithms (lostartoflogarithms.com)
An online book-in-progress by Charles Petzold wherein is explored the utility, history, and ubiquity of that marvelous invention, logarithms including what the hell they are; with some demonstrations of their primary historical application in plane and spherical trigonometry.
- Minesweeper Twist (polyreplay.com)
A variant of the classic game Minesweeper on an irregular grid, where each tile can have between 6 and 10 neighbors, leading to more challenging and mind-bending levels.