Book excerpt: Imagine vast, flowing, 10,000-foot-thick ice sheets covering much of the land. See huge, elephant-like wooly mammoths roaming the tundra. Picture hunting monstrously large mammals alongside the first humans to travel to a new land. This is not an imaginary world. This is our continent, North America, less than 100,000 years ago! Journey into the distant past with this book and witness the earliest events in North America; when much of the continent was still covered in ice, the last of the giant beasts roamed the land, and human beings expanded into new territories to bring the dawn of their (and our) new world.