the medieval knightly system with its religious, moral, and social code.
courteous behavior, especially that of a man toward women.
It was "mountain ranges in the north and west" that helped India develop for thousands of years in this way, since these mountains were very hard to cross with large armies.
Generally speaking, Vietnamese culture was more connected to "Southeast Asian culture" than to China, since China's influence in the region was almost all political in nature.
Nitroglycerin was used in smokeless gunpowders for rifles, pistols and other weapons. It is now commonly used as a medication to treat angina or chest pain.
