Book excerpt: Welcome to Earth fellow human and join us on a fun journey through the most important parts of our history. Using your body as a timeline of the universe, we travel from the bottom of your feet to the top of your head to see how the Earth was formed and how we humans came to be. See how we went from elements, to stars, to Earth and to human technology. A great book for curious humans, ages 8 to 100. Visit www.welcometoearth.net