For picture framers and in picture framing, staples are usually those small, steel,  'U' shaped loops or fasteners that are generally driven into the back of picture frames  to hold the glass, artwork and backing inside the frames so that these don't fall out.  Pretty much every  picture frame has  a couple dozens of these devices which have been used on and in picture frames for hundreds of years. Yet, we don't ever remember reading anything much about them anywhere or at any time, so, here we go.  The staple, as a fastening device, dates from antiquity.  Some of the oldest known were iron dovetail staples found embedded and tying  stones together in several temples and tombs in Pasargadae,  the ancient ...