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In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.

Article: There are a lot of public libraries in Britain. These libraries have more than one hundred and fifteen million books, not including those libraries of public schools. Public libraries not only lend books, music records but also help children, patients in hospitals and others to get special play readings, film shows and so on. The first public libraries were founded in about the year 1850. Today's public libraries usually have a reading-room, a lending room and a reference room. The greatest and most famous library in Britain is that of the British Library in London. It was founded in 1973 and has over 10, 000, 000 books. It has nearly every magazine, newspaper and book published in Britain and other parts across the world.
Answer: 10,000,000 or less.
Solution: How many books are there in the British Library?
Why? In the Article, 10,000,000 is mentioned for the number of books available in the British Library, so this is a good question.

New input: Article: My mother, Marisol Torres, came with her family to Australia in the early 1960s. Then my parents' marriage ended and Mum began the study of precious stones. Her interest in opals took her to the New South Wales remote town of Lightning Ridge. There were no luxuries , but she was closer to nature and had a chance to find black opals and make some money. My mother was beautiful with dark hair and brown eyes, but she was also quiet and shy. Early in the Ridge years, she kept to herself, but later, she started going to the neighbourhood centre to make friends. It was her dream to mine, but her get-rich-quick thinking was unrealistic. She was cheated and she was never very successful. But she kept a sense of humour and a charming smile. Then, just as friendships began to blossom, she was diagnosed with cancer and had to return south for treatment. She had the intention of cooking Spanish food as special treat for her Ridge friends, but died too soon. In her honour, my aunt, Marisa, and I fulfilled her desire when we visited the Ridge in March last year. People who mine the Ridge come from a cross section of society, from lawyers to travels. Looks don't mean much: it can be hard to tell who is millionaire and who is poor. Opals attracted Sebastian and Hanna Deisenberger to Lightning Ridge. They planned a two-year stay, but became permanent residents. Then there's Neil Schellnegger, 45, who moved to the area with his parents when he was a child. He lives with his son, Luke. Luke is a shy 19-year-old boy who enjoys helping his dad. They haven't had much luck over the past couple of years, but their passion for opals conquers disappointment. They love the peaceful lifestyle. Danny Hatcher, 38, is a second-generation miner and president of the Lightning Ridge Miners' Association. He is an optimistic man, driven by the desire to find the perfect opal. "It's magic," he explains. "Once you start opal mining you don't want to do anything else... There is always the potential for finding a million dollars. Nothing beats it." It's a place where dreams --- spiritual or material --- can be fulfilled; a place, for one last bet in life.
Answer: Her passion for nature. .
Solution:
What made the author's mother go to Lightning Ridge?