Rebirth of Learning
In China, nationalism was interesting but not revolutionary. The borders of China stabilized during the Song Dynasty and foreign policy turned mildly isolationist. Rulers enjoyed stronger support from their subjects; it is no accident that the Song emperors rebounded from the loss of Northern China to become the first dynasty in Chinese history to emerge stronger and more powerful following a mid-dynasty collapse. However, because Buddhism had coexisted so comfortably with learning and scholarship, the high culture and art which the Song dynasty enjoyed was a natural continuation of Medieval China's interests. The same arts and many of the same themes continued to be popular, though innovations and social changes meant that these disciplines continued to grow and progress.
Yet while China demonstrated continuity with the past, learning and culture flowered more than ever, and the rise of the middle class created a huge market for education and art. Printing emerged in China more than 500 years before Europe and full color illustrations were a normal part of the wood-block printed books that blossomed during the Song Dynasty. Poetry continued to be a vital art practiced by many important artists who followed in the footsteps of the Tang masters. Drama was another emerging trend; the middle class became avid theater patrons. And Song painting represents a high point of Chinese, even world art, especially the landscape painting of the literati – called shan-shuǐ tú (mountain-water painting).
In Europe, on the contrary, nationalism was like a bomb that rocked the continent. The new national unity challenged the established religious unity. While religion was not immediately affected, its position had been undisputed for a thousand years. With many states more interested in the power which learning could bring them, the easy coexistence of secular nationalism and secular learning became the first serious threat to religion. And the resurgence of learning was the most visible and most vulnerable area where the church could counter attack; after all, asking questions had been frowned upon during the Medieval Era when the only appropriate answer was devout silence and respectful faith. The result was religious backlash and religious wars initially raged across the Europe until a new spirit cooled their fires.
Birth of Science
While China did not exhibit an entirely similar response, any discussion of the Renaissance that ignored the birth of European science would be woefully incomplete. Both China and Europe underwent a surge in naval exploration though Europe's interest in internationalism explains why it continued long after the Chinese lost interest in the outside world. This seemingly minor difference is the primary reason Europe would emerge as the dominant global power. However, beyond opening new lands, Europe also explored a unique new landscape of ideas in ways unknown to any other culture in history.
Islamic thinking, the introduction of the "Arabic numerals" – actually from India – and a broad tradition of Arabic learning had brought important concepts about experimentation to European thought. There were a number of thinkers who continued the classical traditions throughout the Renaissance and beyond. However, others rejected the idea that truth derived from the mind as championed by Aristotle. Outside the church, virtually all men of learning were rejecting the Medieval concept that truth derives from faith. These were both replaced by the idea that truth comes from the five senses, the philosophical school of empiricism. This principle was soon formalized more specifically giving philosophical statement to the expanding acceptance of the Islamic practice of finding truth in the results of practical, first-hand experimentation.
A second but no less important part of empiricism is the belief that numbers could be used to describe the world. This idea could trace its roots back to the mystical numerologists and alchemists of the Medieval and Ancient Eras. However, when merged with a belief in experimentation, science was born. Numbers gave the new scientists a much more reliable way to record and trade information. The level of detail and accuracy which could be conveyed from one experiment to the next and from one scientist to the next was a revolution. Numbers in essence became the new means of communication, the new language that allowed discussion across Europe across languages about all manner of physical phenomena.
Almost equally important, numbers gave concrete and unarguable form to the new scientific truths. In the battle for popular belief, scientists could measure the acceleration of gravity as a number; today the figure is accepted as 9.81 m/s2. Priests could only say that God's love bound the universe together; while the religious explanation was more profound and the two views were in no way incompatible, religion had always defined truth throughout human history, since before the agricultural revolution. Now science could define truth... and it could do so with numbers and decimal points. In the battle for hearts and minds in the Industrial Era, numbers may be the key factor in how scientific truth began to trump religious truth. While only religion spoke to questions of the heart, the ability to ascribe exact numbers to "truth" gave it concreteness and a certainty that religion could not match in the popular imagination.
Thus Renaissance scientists like Copernicus and Galileo waged the first battles against the church for scientific acceptance, though at this point science was not seen that differently than any other area of secular learning which questioned church authority. All the work of the early scientists became the pieces which came together to create the most important document of the Renaissance; in 1687 AD, Isaac Newton published the Philsophiæ Naturalis Principia Mathematica (The Mathematical Principles of Natural Philsophy), known as the Principia. Newton developed the Islamic algebra into the most advanced mathematics yet produced – calculus – and used it to compute numerical data from his experiments and the work of others. From all this data he distilled three simple laws of motion which could be used to generate the results of the experiments he studied.
The momentousness of the Principia can't be overstated as it demonstrates three fundamental foundations of science. It made extensive use of mathematics, it relied on numerical data from experiments to determine natural laws, and it reduced a complex set of experimentation to easily comprehensible laws. Specifically, Newton demonstrated mathematically three fundamental laws which underlie the movement of everything, from a ball rolling across the floor to the Moon moving through the heavens; it was the birth certificate of science as we know it today. Isaac Newton was also one of the founders of the Royal Society, an English "club" of gentlemen devoted to these principles and methodologies. The organization of scientists into formal groups which despite their personal infighting were dedicated to the institutional advancement of science became an important model for the future.