Can see through walls: Open-source WiFi tool detects human movement behind walls without cameras

A new open-source project, WiFi DensePose, uses ordinary WiFi signals to detect human movement behind walls without cameras.
Hackaday

Building A Super-Compact Cistercian Numerals Clock

Around the thirteenth century CE, European society was in the midst between transitioning from Roman numerals to the Arabic numerals that we use today. Less remembered are the Cistercian numerals, ...