An optical fiber connector ferrule blank has, at its distal end, a pedestal region which has a bevel within a carefully chosen range of angles and a second bevel or chamfer which extends from the end of the first bevel at a different range of angles. The liner body has a closed distal end and an open proximal end. In response to a look-away event, the system automatically provides a reading place-marker by accentuating an area at or near where the user looked away from the text. The endpoint may transmit information to endpoints and may transmit recording information to the recording server. The helmet and the cable are connected electrically and mechanically via the magnet connector including the magnet-side socket and the magnetic-body-side socket, which constitutes a pair. The magnetic logic element further includes a magnetization controlling part that controls a relation of directions of magnetizations of the first and second magnetic parts in accordance with a combination of a first binary input data and a second binary input data.