See this question: An exotic yet portable powersource
I love it. I totally LOVE it, but...
Isn't it idea generation question? And if not, what makes it not idea generation?
- There are too many possible answers to the question (Idea Generation is a subset of Too Broad)
- There is no objective way to evaluate one idea as better than others
A common symptom is that answers will tend to list a number of different possibilities rather than expanding on one. This is a consequence of the first problem, as the person posting the response has no way to know which of their ideas are better.
This is science-based, asking for something specific (portable powerful energy sources), answers can be rated based on reasonableness, plausibility, and appropriateness.
I agree it's on the edge but in my opinion it has got a sufficiently constrained answer set to make it workable, and as a result no-one has seen fit to close it.