I have suspected there would be a limit, myself... if only because you can't keep feeding mass in to retain that level of growth... especially if you want to retain relations with the neighbors.
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor