Discover how to create your very own multiplication table and keep it handy with easy steps! Learn about the fascinating history and evolution of mechanical calculators, including the gear-based ...

The Rule of 72 is a simple calculation tool for investors to use, but it's not necessarily the most accurate. Here are some ...

NPR's Ailsa Chang speaks to mathematician Eugenia Cheng about the Pascaline -- a 17th-century invention credited as the first mechanical calculator.

Use rolldice for full RPG features like modifiers and totals. This is the easiest way to roll a die in the terminal. Use shuf ...

Disposable batteries seem so 1990s. Sure, it’s nice to be able to spend a couple of bucks at the drugstore and get a flashlight or TV remote back in the game, but when the device is a daily ...