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

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 ...

Use the sales tax calculator to figure out how much sales tax you’ll potentially owe on a purchase. Many, or all, of the products featured on this page are from our advertising partners who compensate ...

The calculator on your Apple devices can do more than add, subtract, multiply and divide. Here's how it can help you with all kinds of math problems. Trump's Reaction to Melissa Hortman Flag Question ...

OpenRPNCalc is a scientific calculator based on the STM32 microcontroller. Its source code, schematics, and PCB design files are released under an open license. The goal is to develop a hardware ...

TL;DR: This calculator is for pure LoRa modem, not for LoRaWAN. The demo is avaliable here. LoRa is a exteremely powerful modulation method that can transmit data over 3km away. But one of the down ...