Did you know that the Amazon rainforest is often called the "lungs of the Earth"? That's because it produces about 20 of our oxygen! But here's the kicker: scientists believe that over 80 of the plants and animals in the Amazon are still undiscovered. Imagine stumbling upon a plant that could cure cancer or a creature that looks like a mix between a squirrel and a dinosaur! And get this: some tribes within the Amazon have had little to no contact with the outside world, living in harmony with nature for centuries.