Hawk-Eye's system uses seven cameras to track the movement of the ball and sends a signal -- within a second -- to watches worn by match officials when a goal is scored.

CNN: England on course for goal-line history

Ms Angiolini, who has supported a change in the law to allow the Crown to appeal certain criminal cases if they are thrown out of court, said DNA evidence providing a partial match to Sinclair found on items of underwear worn by Christine Eadie and Helen Scott, which were used as ligatures or bindings by the killer, was not presented to court.

BBC: NEWS | UK | Scotland | Edinburgh, East and Fife | Judge in second opinion case hint

For those who really want to keep track of their socks, the app also produces a range of data - checking how black they are, offering to replace worn-out socks and even finding a close match for socks whose partners have gone astray.

BBC: Who wants hi-tech socks for Christmas?