The Silent Type
A lot of intelligent people can be described as introverts, but this is not always true. At any rate, smart people tend to behave based on the situation at hand. They would take the time to assess what needs to be done and act accordingly. Often, they would stay quiet as they survey what needs to be done.
Lovers Of Challenges
It is not unusual for intelligent people to enjoy challenges. They like to think outside the box and have no problems with different methods. They know that a better solution always exists. They like to focus on problems and find ways to resolve them. This lowers their stress levels to let them focus on other things.