The Annenberg Learner draws 10 million visits a month from teachers and learners around the world. There's a reason: the site is intuitive, profoundly edifying, and free to anyone. This 13-unit course, replete with videos, visuals, interactive features, and other resources, represents the cutting edge in online STEM education. Though it is designed primarily for high school teachers, anyone with a hankering for chemical knowledge can teach themselves the basics in this captivating field. On the site, readers may want to start with the Course Guide, which is viewable online or downloadable as a PDF. Then dive into the units themselves, such as Atoms and Light or Acids and Bases, accessing the diverse set of learning tools that are all laid out along the way.