Because if they were not they would no longer be questions but answers.
he checked radiotors
The typical method by which scientific questions are investigated is by experiment.
If its just asking like 10 or 15 questions they are qualifed to kind of investigate. But detectives are specificly made to solve crimes and investigate cases.
Because some answers may be dangerous and difficult for his future
Yes, you can, but to be blunt - there is going to be a lot of questions from law enforcement as to why it took you so long to report it. I hope you realize it will be extremely difficult to investigate and probably impossible for them to confirm that the offense occurred, or solve it.
Asking questions helps them investigate the past in a meaningful way. They also focus the historians research.
Yes.
It depends on what you mean by difficult. There are only a few people answering questions and some questions make no sense.
by doing research on shooting stars or by asking questions and observations
Archive Researchers tackle questions that have sat unanswered for long periods of time. Some of these are more difficult questions and require some research. They may recommend that the more interesting selections become Featured Questions.
Read, practice, ask questions, investigate. You will certainly have to dedicate a reasonable amount of time to it.
PhD students in the field of keyword commonly use research methodologies such as quantitative analysis, qualitative research, case studies, experiments, surveys, interviews, and literature reviews to investigate their research questions.