Our world can be a bewildering place, especially if you've only just got here. Your head will be filled with questions, so let's explore what makes our planet and how we live on it. From land and sky, to people and time, these notes can be your guide and start you on your journey. And you'll figure lots of things out for yourself. Some things about our planet are pretty complicated, but things can be simple, too: you've just got to be kind. 4+ A #1 New York Times Bestseller.