Stanford History Education Group hosts a website filled with US and world history lessons and assessments that are free for teachers to use to supplement their existing curricula. Their goal, as their website states, is "to improve education by conducting research, working with school districts, and reaching directly into classrooms with free materials for teachers and students." The history curriculum and assessments have been downloaded more than five million times. The Stanford Group is comprised of Stanford faculty, graduate students, and visiting scholars, and they are continually adding more content to their offerings, including recently released Civic Online Reasoning assessments and soon-to-be-released digital skills materials. If you teach and/or love history, you may want to explore this website.