Illume does this by offering the world's largest database of syllabi; reading lists; course notes; text and trade books; newspaper, magazine and journal articles; videos; case studies; simulations; problem sets; lecture presentations; and other instructor and student materials. It has just been introduced and it is completely free for all to use. While it is designed for university instructors, high school teachers looking to assign learning materials beyond textbooks will also find it very useful.
"Hungry for exciting activities based in mind-blowing scientific phenomena? Try our Science Snacks: bite-sized versions of Exploratorium exhibits and other investigations that you can build at home or in your classroom using cheap, readily available materials. Satisfy your curiosity without ever getting full. "
One of my foundational rules of classroom engagement is simply this: never be the first one to open your mouth and start talking about any topic. Twenty years in the classroom taught me that one. Never assume. Never take prior knowledge for granted. Listen first, then act. Never presume to know what the students in front of you are capable of. They'll show you if you are bold enough to listen.