Researchers tested wild mushrooms from forests in Poland to see if they contained dangerous radiation from the 1986 Chernobyl disaster. They measured radioactive cesium and potassium in 230 mushroom samples from 19 different species and compared them to soil samples. Good news: all the mushrooms were safe to eat according to food safety standards, with radiation levels below the legal limits. The study shows that mushrooms can be good indicators of how much radiation remains in forest environments.