An exciting look at 75 contributors under age 20 who have done remarkable things, from entrepreneurship to athletics to music and more.Welcome to the future!2 Billion Under 20 is a book, online community, and movement inspired by the 2 billion people in the world currently at or under the age of twenty. We stand for Millennials, Gen Z'ers, and those who want to better understand them and their unique potential. This book shows how we...