1. It’s not too big or too small.
2. The question focuses on some aspect of the topic about which something has been said.
3. It interests the researcher.
4. It potentially matters.
5. It implies an approach, or various means of answering the question.
6. Its raises more questions. The answer to the question might not be simple.
(from Bruce Balenger’s The Curious Researcher: A Guide to Writing Research Papers)
Maybe you're interested in researching something that's happening in the news? Get ideas by exploring these "Hot Topic" guides.