Just finished Leonardo Da Vinci by Walter Isaacson. I enjoyed getting to know Leonardo better. A few take-aways:
– The power of cross-pollination. Mona Lisa’s smile benefitted from the years Leonardo spent studying human anatomy. His realistic landscapes were the product of his studies of geology. Having multiple disciplines swirling around in your head increases the odds that concepts will collide, giving you new insights. 
– In defense of dabbling. To this end, you should have a broad range of interests and not define yourself narrowly as x, y, or z. As children, we’re much more like “Renaissance men,” cycling through phases of dinosaurs, rocks, or music. As adults, we should continue to explore new and interesting pursuits, following our curiosity to wherever it leads us!