The more knowledgeable humans got, the more powerful they became, acquiring resources and arming ourselves with every form of conceivable advancement that the changing times could bring. The pace at which the world changed after the middle of the 20th century might leave one astounded, because it was the time of opportunities and everybody who had the desire to be someone could achieve their dream. Surely there were some failure stories to learn from too, but such was the atmosphere and with the technology on the rise, machines making life better, traveling became faster and easier, that many new business ventures came into being. Here are some of the most powerful lessons from the thought leaders of 20th century ...