It is ethically impossible to ask for DNA samples to every participants in a social science study. Parent OP comment is equivalent than stating that social scie

It is ethically impossible to ask for DNA samples to every participants in a social science study. Parent OP comment is equivalent than stating that social science is impossible. As any opinion, it can be held, and yet some people may find it ludicrous. As for the conclusion of the study, it is rather mild and has been known for a while: social class has impacts on people, especially on education related outcome.