Copyright Notice For The Catalyst Copyright All rights reserved.

All material, including but not limited to, articles, lessons, graphics, multimedia files, and programming code, is protected by United States copyright law. Unless otherwise indicated, these are the property of Michael Geyer and may not be used without the prior written permission of Michael Geyer.

Permission is granted for all material to be borrowed for educational use only. Contributions in the Teachers' Forum section are the property of their authors, who must be contacted separately for permissions outside of educational use. To request use of The Catalyst material in any form outside the bounds of permission granted above, send an email request to or the respective author of the material.