When I was in sixth grade, our science class began its health unit, which was all about the changing body. This portion of the curriculum, naturally, came with plenty of giggles and whispers. Oh, the days when something as simple as the words “breasts” and “penis” were enough to sustain an entire day’s worth of joy, when the numbers 80085 viewed on an upside-down calculator could illicit chuckles from the corner of a room.