What are some common or required physical features of highly intelligent people? And by that I don't mean retarded people who just got there by doing something from the second they were born but are still are not able to think(like Terrence Tao). Its a really underrated topic that is so vital. For an example, you can tell someone is impulsive by his browridge and facial structure, you don't need phrenology for that. What would the best physical and hormonal structure for the most intelligent being possible?