Lesson of the day: Be nice to cavemen
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"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."
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@divinedolphin Yes, he actually said this around 0:40 !