People always learn from their mistakes

      I believe that people always learn from mistakes. Take science and technology for example. To the best of my knowledge, people who created incredible techniques or invented wonderful machine, without machines, without exception, made a lot of mistakes and failed to achieve what they wanted at first, but they learned from their mistakes and they got what they aimed at in the end. All the splendid medical techniques now available in the most advanced hospitals and the space shuttles going back and forth between the earth and space are among such examples. I think these examples show that people show that people can learn from their past mistakes.