Lesson of the day: Be nice to cavemen
"And I'm a bit lazy, I don't want to write six s's. So I'm going to say that there's 1 R, and 6 S's. This is why numbers were invented. Otherwise, cavemen were just drawing all these sticks, and they couldn't keep track anyway."
@divinedolphin Yes, he actually said this around 0:40 !