You should've been in my high school astronomy class. We watched a video over a conceptual planet and its lifeforms, and the best discussion ever in that class ensued. Some of the kids in there were kind just plonked in there when transferring schools, so they and a few others treated it as a blow-off class. Well, after that video the topic of conversation for the whole room went from Isaac Asimov and bio-chemistry, to physics, to archaeology, to meteorology, to -- GAH! I sorely regret not recording that day! It was epic!