In the book of (THE IRON MAN: Elon Musk’s Quest to Forge a Fantastic Future)《硅谷钢铁侠》by Ashlee Vance (阿什利•万斯), it’s suggested one important factor to be more successful is Depth of Knowledge and Cross-boundary Learning. The depth of knowledge means focus of one narrow field and to be a professional person in that area, and method is reading and consulting the top professionals. Cross-boundary learning means thinking out of the box to create new cognition and provide source of innovation, and experience of Musk is to research the core concept of different areas and connect them to the real world.