Got most of them, had the same trouble as you. A former co-worker, who traveled to several countries when he was younger, mentioned that he was in Chad for a while. Nobody else had a clue what he was talking about. He turned to me as I was walking by, and asked, "Jeff, where's Chad?" I said, "Africa... north Africa... just below Libya to be exact." He asked, "How in the heck did you know that?!" Middle school. I remember asking the teacher what country was below Libya as he was explaining the air strikes Reagan ordered on them in 1986.