When I was in elementary school, my parents used to take me and my sisters trick or treating at the Natural History museum. My mom would dress us up in some last-minute costume so we could hang out with dinosaurs the Sunday before Halloween. So when the Natural History Museum announced that they were closing this December and moving to the new Biological Sciences building, I knew I had just one last chance to experience Halloween in the Hall of Evolution. As I gazed upon the line of trick-or-treaters at the museum last Sunday, all those memories of me in costume came back.