Why only "science related" people are "permission-ed" to go to Space?

I mean there was an exception I know of when a teacher was planned to sent up there, but the disaster happened so... but overall, why is it an "obstacle" to only work with people that have special educations and not ordinary folks too?

Submitted October 19, 2018 at 07:22PM by BladePocok https://ift.tt/2CrOc4x