Is There Such a Thing as an Animal Soul or a Plant Soul?

"I think it is useful to have as a work in hypothesis that something rather radical happened to the culture of homo sapiens around it," he says. "What these new humans were able to do was radically different from what any other animal was ever able to do, as evidenced by the fact that I'm talking to you via a computer right now." He adds: "It's going to be very difficult to explain this as sort of a slow evolutionary trajectory"