How common do the ideas need to be? Does the scientific method count?
I think deciding whether or not to do a controlled experiment for a question that you have is a fairly complex question. Most of the time in our life when we face questions we don't use the scientific method to answer them.
I was just wondering. Human minds are messed up in 1001 ways, but are there a few rational principles that most people already have down? Of course, the answers to this question are probably so extremely obvious that I haven't even considered them. But I ask all the same.