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Nancy Drew 27: The Deadly Device Hints
What's important on the bulletin boards?
1 of 3: There are two bulletin boards, one on each floor. Each has something you need to notice, and you might want to have Nancy take a picture of both of them with her phone.
2 of 3: The first floor bulletin board has a copy of the periodical table of elements. This will be helpful, though you won't need to refer to it often.
3 of 3: The second floor bulletin board has a poster listing some interesting facts about electricity and incidentally showing you the binary version of the numbers 1 through 15. You'll refer to it repeatedly throughout the game, and at least one puzzle won't be triggered if you haven't looked closely at the poster.
