At first, it sounds like another startup fairytale. A 19-year-old Princeton freshman starts a company with the hopes of making a tangible difference in the world, and it grows into a global, multi-million dollar venture. But stories like TerraCycle founder and CEO Tom Szaky's are never as they seem. It takes more than just a genius idea to succeed. Businesses that are looking to make a transformational global impact require hard work, incredible business savvy and the courage to press on when everyone calls you crazy.