Why was Einstein so smart? Was it because the wires in his brain were connected unusually? Or was it because of something else ??

Einstein was genius and his brain was the topic of research. Many researchers did research on his brain. They found that the corpus callosum which is a thick bundle of nerve and connects the two hemisphere of the brain was thicker than the group of 15 elderly men and 52 men, at the same age when Einstein (1905) gave his famous theories. The thickness of corpus callosum is regarded as that there were more nerves which results in better connectivity.