Rainforests are inviting, but they provide unique challenges to those who become lost inside. They're wet and humid, full of biting insects and treacherous ground. Tall trees blot out the light and make it hard to navigate. But there's hope in that darkness. From the Amazon to the Congo, the rainforests are home to countless cultures with ways of making the most of their complex home. Think ahead and you too might find you are resourceful enough to survive in the world's most complex ecosystem.