By becoming a member, you contribute to our mission of providing free, high-quality educational materials that empower teachers and students alike. We have already reached over 4 million students, and with your support, we can reach even more.

Initial membership starts at $100, which enables us to support one teacher who , in turn, reaches and average of 100 students per semester. While the Certell Circle Club offers various benefits at different giving levels, every contribution is impactful. Join the Circle that suits you and play a vital role in helping teachers teach students how to think, not what to think.