Turns out the surveillance state really is nothing new! Really fun story about the history of letter locking in 17th-century Europe from Atlas Obscura.
Nadine Akkerman, a senior lecturer at Leiden University, is an expert in 16th- and 17th-century espionage. But during her research into the Black Chambers, she ran across something perplexing—a document by Samuel Morland, a British spymaster, in which he bragged about his talent for opening and resealing letters. “Wait,” she thought to herself. “Can’t we all do that?”
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.