 was unfolded in engineering, mathematics, especially mathematics, astronomy, navigation, physiology. And you say, well, why is that so? If you look at what was going on, they were open to all lines of thought. Jews, Muslims, Christians. There were doubters back then. Today, we would call them atheists. They would all come around the table and share ideas. If you have some philosophy that's got holes in it, someone's going to find it.