Hi there, welcome! I am new here too, but quickly became obsessed!! I'm leaning boy based on the angle and roundness of the nub, but it's not a very obvious nub so it's a cautious lean. Check out this article, it was SO helpful at educating me on all of this nub stuff - good luck! http://onlinelibrary.wiley.com/store/10.1046/j.1469-0705.2001.00421.x/asset/315_ftp.pdf?v=1&t=h19ktz5s&s=6b1009264066d638b427114b73c192cf0ac2d4b5