Good times reduce child mortality reduced child mrotality leads to bad gene accumulation Bad gene accumulation leads to bad times. bad times leads to increase child mortality.... ... ... intelligenc eind ecline since 1800s. welaht andIQ negaitvely correlated wiht survivng offsprings. Before, top half of society had 2x surviing offspring as bottom half. nigga niggas. IQ positive genes consistently decline every generation even within same bloodlines.