FANTASTIC FUNGI is a vivid journey into a realm of nature almost unknown to us - mushrooms. This fungi threads itself into cross-branched networks that thrive beneath us nearly everywhere on the planet. It makes the soil that supports life. It's the largest single organism on Earth. And here's the oddest part: researchers believe these mycelium networks are sentient, aware of our presence, "brain-like" and perhaps even "conscious." It sounds like science fiction, but it's all fact.