Ask any professor, and they’ll probably tell you graphing calculators offer a plethora of mathematical uses, like plotting graphs, inputting trigonometric functions — you know, typical academic stuff.

Check out this geeky water-powered calculator. It uses three water batteries for power that have two electrodes inside made from a special alloy which, when immersed in water, produce electricity ...

With Excel, you can create simple calculators that speed up calculations you perform frequently. Among the many calculators that you can create with Excel is one that handles the pricing of options, ...