Discrimination

>>136870808
Which studies support the ideas of an implicit or conscious bias found in classrooms against those groups who have higher attrition rates?

If you desire to think about these things on an individual level, not everyone is intelligent enough to be an engineer, or an innovator, etc.
On a macro level, we see trends that suggest that some groups are, on average, less capable than another.

The world is unfair and no one is born equal, even if born under the same circumstances.

>>136872071
Studies show teachers have lower expectations of black students. That is probably reasonable, but could also be bad for students.