Abstract: A UAV for transporting a payload comprising a vehicle body; a retractable rail exposed on an underside of the vehicle body; a retraction mechanism coupling the rail to the vehicle body for causing the rail to raise and lower relative to the vehicle body; and a barrier located on the vehicle body so as to confront the rail when the rail is in its raised position to block the removal from the rail of a payload slidably engaged with the rail. A mechanism for advancing a payload onto and along the rail and pushing it off.

Abstract: A media playback system comprising a transmitter configured to transmit an indication of a media item; a plurality of drones; a controller configured to control the spatial configuration of the drones and, in response to receiving the indication of a media item, control the drones to adopt a predefined 3D spatial configuration; a mobile device comprising a camera and a media playback unit, wherein the camera is capable of capturing an image of the plurality of drones; a processor configured to analyse the captured image to determine the media item that corresponds to the predefined 3D spatial configuration; and wherein the media playback unit is configured to play the determined media item.

Abstract: A media playback system comprising a transmitter configured to transmit an indication of a media item; a plurality of drones; a controller configured to control the spatial configuration of the drones and, in response to receiving the indication of a media item control the drones to adopt a predefined 3D spatial configuration; a mobile device comprising a camera and a media playback unit, wherein the camera is capable of capturing an image of the plurality of drones; a processor configured to analyse the captured image to determine the media item that corresponds to the predefined 3D spatial configuration; and wherein the media playback unit is configured to play the determined media item.

Abstract: A UAV for transporting a payload comprising a vehicle body; a retractable rail exposed on an underside of the vehicle body; a retraction mechanism coupling the rail to the vehicle body for causing the rail to raise and lower relative to the vehicle body; and a barrier located on the vehicle body so as to confront the rail when the rail is in its raised position to block the removal from the rail of a payload slidably engaged with the rail. A mechanism for advancing a payload onto and along the rail and pushing it off. FIG.

Abstract: A method for determining the flexion or extension of a joint of a human or animal subject, comprising: applying a plurality of strain gauges to the joint in a known configuration; applying a first inertial measurement unit, IMU, to each strain gauge; receiving strain data from each of the strain gauges; receiving motion data from each of the IMUs; and calculating the flexion or extension of the joint in dependence on the received strain data, motion data and the configuration of the strain gauges.

Abstract: An apparatus for determining the arterial structure of the hand of a subject, the apparatus comprising a wrist pulse measurement device configured to measure wrist pulse signals at the wrist of the subject, a digit pulse measurement device configured to measure digit pulse signals at the digits of the hand, the apparatus being configured to compare the arrival time of one or more waveform features in a wrist pulse signal and the arrival time of the corresponding feature in two or more digit pulse signals in order to determine a pulse transit time for each of the one or more waveform features, thereby estimating the arterial structure of the hand.