Santiago Ramón y Cajal
![Ramón y Cajal in 1899](https://upload.wikimedia.org/wikipedia/commons/b/ba/Santiago_Ram%C3%B3n_y_Cajal_%281852-1934%29_portrait_%28restored%29.jpg)
Hundreds of his drawings illustrating the arborizations ("tree growing") of brain cells are still in use, since the mid-20th century, for educational and training purposes. Provided by Wikipedia
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