"Perpetual flip calendars have been around for a while. They seem operate very simply, but I could not for the life of me figure out how!" says woodworker and YouTuber Measured Workshop, who decided ...

Clocks are a mainstay of hackers and makers, as they provide a way to explore creative designs while still maintaining a functional aspect to the project. [Brett Oliver] follows this tradition in ...

Flip calendars are a neat little piece of history. Sold as tourist trinkets, they sit on your desk and show the current day of the month and, depending on the particular calendar, month and year. Each ...