Life of Pythagoras was super influential to my life. I was very inspired by the way Pythagoras lived his life - a 100% commitment to finding out what is true, travelling all over the world amassing knowledge/practices/skills through humility, trying so many things out and finally spending so much of his life teaching. Pythagoras was probably the greatest philosopher ever. I also recommend reading about Archytas, one of his spiritual descendants, his thoughts on math, mechanics, music, learning and philosophy are amazing.
Archytas is famous for having designed a steam powered glider. And for having freed Plato from his brief slavery. But he also appears to have written the first treatise on mechanical engineering:
