The main idea of the first paragraph of "Leonardo da Vinci: Renaissance Man" is: Leonardo da Vinci was interested in many fields.
A Renaissance man as portrayed in the book is defined as a man who is knowledgeable or proficient in a variety of fields. In particular, it refers to a person who excels in science and mathematical fields, as well as in the humanities. There are lots of historical and modern examples of Renaissance men or women as the case may be.
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