Hand sanitizer is an easy, accessible way to fight viruses and bacteria (including Covid-19). So we pitched an idea to a healthcare client to give people an extra reward for using hand sanitizers by rigging them to make Super Mario power-up noises. The client didn’t shut the idea down cold before we even did a proof-of-concept…but I knew we were onto something. So, for the good of humanity, I decided to just make it myself. I learned to program Arduino and solder, and when the thing was done, I stuck it on the side of the YMCA in downtown Seattle and observed the results.