Eugenics
Another line of thought goes like this. During their evolution, humans were subject to natural selection like any other form of life. On average, healthy and intelligent people had a better chance of reproducing. In modern civilisation, however, it often seems that this process does not apply. Alfred Russel Wallace and Charles Darwin had discussed this very point, with concern.p70 In countries where statistics were collected, those statistics showed that in many cases the poor had more children than the rich. Also, statistics showed that the total population of some great nations was declining.p73 One startling piece of information was produced by research directed by Karl Pearson, the Galton Professor of Eugenics at University College London, and the founder of the Department of Applied Statistics. The finding was that half of each succeeding generation was produced by no more than a quarter of the previous generation, and that quarter was "disproportionately located amongst the dregs of society".p74