Did the Aztec really practice human sacrifice? Who invented the toothbrush? What is the smallest country in the world? Ask History, a blog from the History Channel, answers these questions and hundreds more just like them. If you have ever wondered how fast the world's population is growing, where the dollar sign came from, or when the United States started using time zones, then this fascinating back and forth of questions and answers is for you. In addition to the well-composed articles that answer these fascinating questions, most articles feature a list of links - both to other articles in the section, and to videos, podcasts, and explanations from around the sizable History.com site. Readers may also search the site by Most Popular (for instance, Did George Washington have wooden teeth?), Top Categories (Crime, Royalty, and others), or by using the Google-powered Custom Search.