There has never before been clear evidence that intense thermal radiation and winds from an exploding comet created glasses here on Earth. Though some of the pieces of greenish-black Pleistocene-era glass found in the area are in the form of thin slabs, many look twisted and warped, and some melts ended up forever entangled with others. That means there was enough heat for them to be reshaped again and again before it finally died down, though some still have blobs of sand and other materials that never melted. This glass was tortured.
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.