Film actress "The It Girl" was Clara Bow who starred in not only 46 silent films in the US but also 11 talkies. She earned the nickname from starring in the 1927 silent film called "It".
As well as being a spy, for which brief career she was both celebrated and then executed, in what other profession did Mata Hari engage?
What was the profession of the person who invented the mechanism of the door lock for London toilets operated by payment of a coin, initially one penny?