https://www.exploratorium.edu/tinkering/blog/2014/02/13/inputs-and-outputs-after-dark
https://www.exploratorium.edu/tinkering/projects/circuit-boards/
https://www.exploratorium.edu/tinkering/blog/2015/08/27/homemade-switches
https://www.exploratorium.edu/tinkering/blog/2016/07/21/homemade-switches-in-afterschool
https://www.exploratorium.edu/tinkering/blog/2014/04/22/battery-pack-heat-prevention-hack
https://www.exploratorium.edu/tinkering/blog/2014/09/19/spring-into-breadboarding-
https://www.exploratorium.edu/tinkering/blog/2016/07/28/toy-take-apart-and-programming-paper-circuits-with-arduino-uno-scratch-
https://www.exploratorium.edu/tinkering/blog/2011/09/26/tinkering-101-day-2-circuits-explorations
https://www.exploratorium.edu/tinkering/blog/2012/04/03/open-make-tools-circuits-three-ways