>In particular, I believe the domestication of fire is the dividing line between humans and animals. Must there be only 1 line? To me, language is another imp

>In particular, I believe the domestication of fire is the dividing line between humans and animals. Must there be only 1 line? To me, language is another important one as it greatly increases the efficiency that one can communicate information generation to generation and it seems to have an impact on how we think. Children raised without exposure to language seem to suffer developmental issues, though this isn't well studied given the ethical issues involved in such a study. As to how much communication is needed to count as a language, that is much harder to draw a definite line given that other species do communicate, but we don't consider them to have a language.