Hands-on with a non-functioning Surface Duo prototype, which has two 5.6-inch OLED screens forming a 8.1-inch display, bound together by a unique hinge (Scott Stein/CNET)

Scott Stein / CNET:
Hands-on with a non-functioning Surface Duo prototype, which has two 5.6-inch OLED screens forming a 8.1-inch display, bound together by a unique hinge  —  Inside a little white box in front of me is a gadget that looks like a little book.  The Microsoft Windows logo is embossed on top.