Here are some answers to questions you always wanted to ask - and a few more.

In tonight's programme how London Zoo and then Nottingham hospital's gynaecological unit used computer technology, which was originally designed to look at the flow of traffic, resulting in an infertile couple able to have a healthy baby girl. Also featured is how to capture on film, birds flying in formation; why the Post Office want people to use their postcodes and how the postcodes actually work; and how men work on live wires, which are carrying up to 400,000 volts, only protected by special suits.
Presented by Desmond Lynam and Jenny Hull.