High income people eat better food, are more secure in their housing, are more likely to live as part of an in-tact nuclear family, have better health, more reliable transportation, better resources, access to tutors, etc. Low income people are more likely to suffer deficiencies in all those areas, have more obligations to work full time during years when they should be studying, more negative influences from drugs, violence, hopelessness, depression, etc. Cowards like Sealybobo are so scared of them that they are more likely to be isolated and avoided instead of networked and encouraged. There is also a great deal of data on the short and long term effects of different types of trauma on the ability to learn.