“If you never created and played with Shrinky Dinks as a kid, they’re basically thin sheets of malleable plastic that are drawn on and then shrunk when put in the oven. The result is a very tiny and hard piece of plastic that has your masterpiece on it. Seemingly insignificant as a children’s toy, Shrinky Dinks are now being incorporated into a wearable that could help individuals with asthma, cystic fibrosis, and chronic pulmonary conditions…”

Source: https://www.ecnmag.com/news/2019/02/shrinky-dinks-inspire-wearable-predicts-oncoming-asthma-attacks