They are the shortest on average and over the years of stern heavy education have left the Blues without much of a sense of humor. They are strict and to the point. This might be why their civilization is the most advanced. Deviant Isle is the most automated place on Sanctum. Drones do most all the work leaving the Blues to work on Space Travel.
Now most of the population has at one point or another made it into space. Either for recreation or work.