So that when there was a sudden accidental discovery by one member of the group, say the use of fire, or a particular type of tool, instead of dying out, this spread rapidly, horizontally across the population, or was transmitted vertically, down the generations.
Si atunci s-a intamplat ca o descoperire accidentala facuta de catre un membru al grupului, sa zicem folosirea focului, sau un anumit tip de unealta, care, in loc sa dispara, s-a raspandit rapid, orizontal, in randul populatiei, sau a fost transmisa vertical, de-a lungul generatiilor.