During the Three Kingdoms period of ancient China, there was constant warfare occurring in the Central Plain of China. Northerners began to enter into Fujian region, causing the region to incorporate parts of northern Chinese dialects. However, the massive migration of northern Han Chinese into Fujian region mainly occurred after the Disaster of Yongjia. The Jìn court fled from the north to the south, causing large numbers of northern Han Chinese to move into Fujian region. They brought the old Chinese — spoken in Central Plain of China from prehistoric era to 3rd century — into Fujian. This then gradually evolved into the Quanzhou dialect.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What disaster caused a massive migration in the Fujiian region?
Ah, so.. the Disaster of Yongjia

The Roman physician Galen also argued for the importance of the brain, and theorized in some depth about how it might work. Galen traced out the anatomical relationships among brain, nerves, and muscles, demonstrating that all muscles in the body are connected to the brain through a branching network of nerves. He postulated that nerves activate muscles mechanically by carrying a mysterious substance he called pneumata psychikon, usually translated as "animal spirits". Galen's ideas were widely known during the Middle Ages, but not much further progress came until the Renaissance, when detailed anatomical study resumed, combined with the theoretical speculations of René Descartes and those who followed him. Descartes, like Galen, thought of the nervous system in hydraulic terms. He believed that the highest cognitive functions are carried out by a non-physical res cogitans, but that the majority of behaviors of humans, and all behaviors of animals, could be explained mechanistically.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): The physician Galen was from which country in history?
Ah, so.. Roman

Whilst it is often perceived as an optimal solution for states comprising different cultural or ethnic communities, the federalist model seems to work best in largely homogeneous states such as the United States, Germany or Australia, but there is also evidence to the contrary such as in Switzerland. Tensions between territories can still be found in federalist countries such as Canada and federation as a way to appease and quell military conflict has failed recently in places like Lybia or Iraq, while the formula is simultaneously proposed and dismissed in countries such as Ukraine or Syria. Federations such as Yugoslavia or Czechoslovakia collapsed as soon as it was possible to put the model to the test.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Where does the federalist model work worst in? 
Ah, so..
unanswerable