/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: thesexybuttocksman https://cdn.slidesharecdn.com/profile-photo-thesexybuttocksman-48x48.jpg?cb=1523524547 I don't know how to add and subtract negative integers, but I do know when Dr. John Watson's birthday is.