Wired reports on the science behind one of our most productive summer rituals:
“It’s just physics and chemistry, essentially,” says Dr. Steve Wang, head of dermatology at the Memorial Sloan Kettering Cancer Center in New York City. Ultraviolet radiation from the sun hits your skin at wavelengths ranging from 290 to 400 nanometers. This span includes both UVA and UVB radiation, though it’s the UVBs—with wavelengths ranging from 290 to 320 nanometers—that are the bigger threat.
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, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, 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.