I asked students in my Scientific Inquiry class, an Elementary grade Science Methods course, to construct stream-cleaning machines, using Teacher Geek building materials and recyclables. They were able to visit the TeacherGeek.com site for building guides, construction ideas, and to see photos of similar builds. While they could use the Teacher Geek documents for ideas, they still had to add a "cleaner" attachment to their machine. The students were quite innovative in solving this problem, some added scoops, some added trailing net bags, and one developed a water filtration system using a wind-powered water pump. The photos below show some of the machines. Wind-powered trash scoop boat with hydraulic lifts for the scoop. This was developed by Emma Jones, Bailey Lustig, and Allie Smith. Julia Grass' and Emily Stoklosa's solar-powered fan boat with trailing net for collecting debris. Close up view of J...