Did you know that trees have their own secret network? Through an underground web of fungi, they can warn each other of potential threats and even share nutrients. But that's not all - the world's largest living organism is a fungus that spans over 2,200 acres in Oregon, USA. And let's not forget the importance of forests in producing a whopping 28% of the world's oxygen. The next time you're out for a walk in the woods, remember the hidden world of communication and cooperation happening beneath your feet.