Mary was 18 when she started writing it which goes to show how her mind was able to create fantastical images and put it on paper to scare the dickens out of everyone else. Her understanding of electricity and the use of conductors were ahead of Tesla's time. She continued writing for several years, approximately four more novels along with biographies and travel guides. Frankenstein's first theatrical adaptation was in 1823 and it made its way to silent film for the first time in 1910. It was one of the first major scary movies ever filmed.
Mary was extremely intelligent as she came from a family of philosophers and writers. Her mother led a feminists' movement in London but died one month after Mary's birth. Her first husband passed away and Mary lost three children to illness but one son survived who she spent a lot of time travelling with even when he was an adult. She died in 1851 at the age of 54 from what was believed to be a brain tumor.