Slightly unrelated, but I did a project this past semester in Grad School looking at the economics of a solar sail de-orbiting mechanism to attach to satellites

Slightly unrelated, but I did a project this past semester in Grad School looking at the economics of a solar sail de-orbiting mechanism to attach to satellites. Seeing the successful demonstration here just gives me the slightest sense of pride and vindication toward the people in the class who said there's no practical use for something like that. That being said, the project itself was a disaster and I'm glad to have escaped the class with a decent grade despite it.