Open questions, all materials prepaired by Martin Zarybnický (CZ):
- ENERGY CRIMINALS (.doc)
- INTRO PPT – OPEN QUESTIONS (.ppt)
- OPEN QUESTIONS METHODOLOGY FOR TEACHERS (.doc)
- SAVING ENERGY AT SCHOOL (.doc)
- SOURCES OF ENERGY POSTER (.doc)
- WASTING AT HOME (.doc)
Susuworld 
Just for sure, some activities do not come from my head, but are based on other ones I found on the Internet.