if anyone finds any FREE introductory guides to electric circuits, computers, etc., or FREE online children's books on electric devices, how stuff works, or other FREE materials, FREE programs, etc. (FREE as in free speech, e.g. GNU GPL) please let me know so that we can add links from these pages.

there are a great many good introductory sites with easy-to-understand diagrams about how things work, and the basics of electric circuits. new sites relevant to microprocessors will be added as peripheral readings and fun introductions to related material.