As a side rant, it amazes me that people DON'T do this. I'm obsessive about talking to my NPC party members, so it boggles my mind when people miss out on relatively easy-to-find information about the story if they just took the time to even talk to their party members occasionally.
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It's because when you are walking around with your party members, there aren't reminders to talk to your party, and everyone needs someone to tell them what to do...