Humans have tracked time in one way or another in every civilization we have records of, writes physicist Chad Orzel. In his new book A Brief History of Timekeeping (BenBella Books, 2022), Orzel chronicles Neolithic efforts to predict solstices and other astronomical events, the latest atomic clocks that keep time to ever more precise decimals and everything that came in between. He describes the evolution of clocks, from water clocks that timed intervals by how long it took water to flow out of a container to hourglasses filled with sand to the first mechanical and pendulum clocks to our modern era. Each episode is filled with interesting physics and engineering, as well as a glimpse at how different ways of keeping time affected how people lived their lives at various points and places in history.
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.
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