Great resources by AAAS for teachers: My favorite was this one: Scorpion Hunters http://
specialprojects.sciencemag. org/xxfiles/?intcmp=NEWS-xx- files-PROMO
They are developing teaching materials and linking them to Science Net Link: http://sciencenetlinks.com/ click on their collections. This is the best clearing house of great materials for your classrooms. It is all free and you do not have to join AAAS.