Mathematicians love a good puzzle. Even something as abstract as multiplying matrices (two-dimensional tables of numbers) can feel like a game when you try to find the most efficient way to do it.

Japan's Casio Computer Co. is going back to basics--in emerging markets, at least. While the maker of G-shock watches has decided to jump into the still-infant smartwatch market in Japan and the U.S., ...

This file type includes high resolution graphics and schematics. You can build an analog calculator using a pulse-width modulator (PWM) to perform accurate four-quadrant multiplication and division.