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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: In Sonoma County, California, growers are planting grapevines in a new way. As they plant the vines, they add a package of water called DRiWATER. This method of planting grapevines along with the water supply saves time and work. It gives the plant enough water to keep growing. The workers can go on to other chores. DRiWATER is a package of jelled water. It melts slowly, watering the plant for two or three months. DRiWATER is a 100% natural, non-poisonous product used for the long-term watering of plants. It was invented by a well-known food chemist who recognized the potential of a filler product he was using to thicken peanut butter. He tested and applied his theory that water could be released over time as naturally occurring microbes in the soil fed on the filler and released the water into the soil. The inventor, Harold Jensen, tried for a long time to get the right recipe. He and his family worked nights and weekends testing different formulas. Jensen finally found the right formula and patented it. What are the ingredients in DRiWATER? It is made up of 97.85% water, 2% vegetable gum, and 0.15% aluminum sulfate. When the DRiWATER is planted in the soil, the water is released as bacteria eat the jell. Buchanan Vineyard Services has bought ten thousand packages of DRiWATER. They will plant the jelled water with their new grapevines. What about countries like Egypt that have large deserts? Maybe DRiWATER will help grow trees in the desert. Two million trees have been planted near a town in the Sahara Desert. Two quarts were planted with each tree. The tree must live on the water for months until its roots touch ground water. Harold Jensen hopes to see forests spring up in the deserts. This is the reason that he invented DRiWATER. Seedlings, DRiWATER, and desert may be the perfect fit.
Answer: He made it with the help of his family.
Solution:
How did Harold Jensen invent DRiWATER?