I was a bit surprised that this question was downvoted. As far as building up encyclopedic knowledge, I thought it was pretty good. Asking for reasons in the comments, the "does not show any research effort" bit from the downvote arrow tooltip was given.
If this is applied diligently, a lot of the beginner type questions should be downvoted, since the information is often readily available. I thought the purpose was to build up a knowledge base here. Many of our questions are answered in more than sufficient detail on Wikipedia.
So what level of research is enough to not warrant a downvote? I think good content sometimes comes from questions where little effort was made.
I don't know if we need to change anything, I think I was just surprised seeing this question downvoted, which I saw as a good content-creator, especially when we just had a discussion about closing questions for not enough previous research.
In this particular case, wouldn't a minor edit fix the question? We have a lot of questions basically created to make content, and those could be said to lack previous research too.