I often wish there was a way to let my computer know how angry I am without having to resort to physical assault. Soon, however, it may be able to detect my discontent from my furrowed brow and evil slitty eyes. A team of top techies are working on a computer system that can decode the emotions of a user by analysing facial expressions in much the same way as humans do instinctively. There may be certain computer-based pastimes where you feel the need to cover the camera, though.