| Re: terracotta
They are smart http://en.wikipedia.org/wiki/Lemming so they are not dumb enough to dive over the cliff unless they see food at the bottom or the opposite sexes of the same species.
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Time independence: [∂E(g)]²=[∂F(a)×∂r(a)]·[∂F(b)×∂r(b)] and Mass independence: ¶a(t)·¶r(t)=c²
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