Always go back and take a look at something you first saw when you "didn't know too much." When putting together the footnotes for an upcoming Casefile Clues article, I reviewed a website that listed items in a special collection that I had used for the article. When reviewing the item I used, I saw an item listed below it that meant nothing originally. After having read the item I had been sent, the second item ended up being relevant to my family.
If I hadn't gone back, I might have missed it.