PHOTO CREDIT: FLICKR USER GEMMERICH VIA CREATIVE COMMONS
In what is probably the most horrifying revelation in all of these lab tool histories so far, the reality about life before formal pipetting is that when scientists didn’t have proper tools to move liquids around they just used a straw and their own mouths to create suction. According to a paper titled “Hazards of Mouth Pipetting,” produced by the US Army Biological Laboratories in 1966, one of the earliest recorded examples of the hazards of using one’s mouth for this purpose came in 1893 when a doctor accidentally sucked a bunch of Typhoid bacteria into his mouth. The paper went on to express concern that it was much too easy to inhale vapors, especially from radioactive solutions, even when the liquid being transferred never made contact with a scientist’s mouth.
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.