Of an estimated 2.2 to 3.8 million species of fungi on Earth, only about 4 percent have been documented and described. The interactions between fungi and humans are ancient — fungi have been around for about 1 billion years, according to a recent discovery based on fossils collected in northern Canada by an international team of researchers. The previous estimate was about 460 million years. This research shows that fungi appeared on land prior to the evolution of flowering plants, prior to the rise of insects, and long before the evolution of mammals. Other research shows that our distant ancestors were interacting with fungi. It’s no wonder, then, that we have developed sensors throughout our bodies to detect the presence of fungi. Since then, the scientific research and publication on the myriad ways fungi interact with our immune system and other body systems, as well as their disease-preventing and healing properties, have grown tremendously. Currently, the published scientific