Where did all that stuff come from?

Just about everyone will agree that trees are made from sunlight, water, and soil the trees sucks up from their roots. But the surprising truth is that trees are made from air! Trees are solar-powered machines that convert air into wood. Why is it that, despite the fact that photosynthesis is one of the most widely taught subjects in science, so few people really understand the central idea underlying this system?

Watch the video here.

I think this is more of a commentary on teaching than it is a criticism of these students, or students in general.