High-conductivity, low-temperature reactive silver ink made with three ingredients. Material science demystified for the amateur chemist, and reproduced accessibly for the home lab.
After reading a UIUC materials science research paper, I built a small makeshift chemistry lab to reproduce the conductive ink at my (then local) hackerspace. After my success, I wrote step-by-step, easy to follow instructions so that everyone else could make it at home. In addition to Engadget, Hackaday, and Makezine, this was featured later that year in a TED talk by Caterina Mota.