Focusing on one thing gives you a single point of failure—whether it’s a job, an investment opportunity, or an entrepreneurial venture. When engineers design a bridge, they never want to have a single point of failure. If the wind picks up to two hundred miles per hour and a cable fails, the bridge still has seven other cables to back it up. Likewise, you’d never want to build your wealth around one endeavor. If that one thing fails, you’re destroyed, and you have to start again from scratch. Ignore the conventional wisdom that says it’s impossible to multitask.