The short answer? Networking. By getting cozy with math teachers, Texas Instruments became the trusted brand for graphing calculators. Teachers now know the brand’s interface so well that it would be inconvenient for them to switch.
The Crazy Calculator goes beyond letting you spell “boobies”. In prank mode, when you enter an equation it’ll display a funny reply using actual letters. Also works as a regular calculator.
Sure, there’s an app for just about any calculator you’d ever need, but TI’s new calculator breathes new life into the dying breed, with a 320×240 color 3D graphing display and wireless networking.
Made by Jonathan Bittner, it estimates price per sq.ft. and divides your place into bedrooms and common areas. The effects of other parameters are based on surveys conducted by Bittner.
Evil Mad Scientist Laboratories has a DIY for making your own Fraction Adding Machine out of a Rice Krispies Box, glue and tape. It’s based on an actual 1952 calculator.