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The most expensive book ever purchased was sold for $30.8 million. It was Codex Leicester by Leonardo Da Vinci, and it was purchased by Bill Gates, according to Business Insider.

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In the world of rare and valuable books, one stands out for having fetched an astonishing price at auction. The Codex Leicester, a collection of scientific writings by Leonardo da Vinci, claimed the title of the most expensive book ever purchased when it was bought by none other than Microsoft co-founder Bill Gates. In 1994, Gates acquired this historic manuscript at Christie's auction for a staggering $30.8 million.

The Codex Leicester is a 72-page document which showcases da Vinci's observations and theories on a range of topics from the properties of water to the characteristics of rocks, and even fossil evidence and the movement of celestial bodies. The notebook is named after the Earl of Leicester, who bought the manuscript in 1717. Its contents provide a rare insight into the inquisitive mind of da Vinci, making it not only a precious historical document but also a testament to the breadth of his intellect and curiosity.

This manuscript is penned in da Vinci’s famed mirror-writing style, where the text appears reversed, only becoming legible when held up to a mirror. Bill Gates' acquisition of the Codex Leicester wasn't just a purchase but an investment in preserving a crucial piece of scientific and artistic heritage. After buying the manuscript, Gates decided to digitize it and make it accessible to the public. He occasionally loans it out to museums, ensuring that the insights of the great Renaissance polymath are shared widely and not just confined to a private collection.

The purchase of the Codex Leicester is a significant reminder of the enduring value and appeal of historical documents, especially those that have changed our understanding of the world. The transaction at $30.8 million underscores not only the monetary worth of such artefacts but also their immense cultural and educational value.