(Editor’s Note: In our efforts to build up DCist’s Arts + Events coverage, we’re bringing a number of new contributors who you’ll start seeing during the next week or so. The following post was written by Susan Breitkopf.) Who knows what secrets lurk in the bowels of the Smithsonian? DCist has heard rumors about shooting galleries, cadaver-sniffing dogs and catalogued human remains, but few on the inside breathe a word to the rest of the…