Steve Sonnenberg credits his entrepreneurial "superpower" with helping him turn a side hustle into a company that's now valued at $1 billion, he says. The key to his success, he says: He's not fazed by the risk of launching a new venture, or by the inevitable setbacks that follow. "When it comes to entrepreneurship, my superpower is all about just beginning. It's very easy for me to start, because that's just who I am," says Sonnenberg, 44, the co-founder and CEO of employee rewards platform