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Meteorological Phenomena [A] [Preface:] Crack-making on bingshen [day 33], Que divined: [Charge:] “On the coming yisi sday 42], [we] will perform the . Counts and weights of fire-cracked rock, ground stone and obsidian from temporally secure contexts Fire-cracked rock Ground stone Obsidian # Kg # Kg # Kg . Needham, Science and Civilisation in China, vol. 5, p. 112. . Why a crack must achieve a critical length before growing rapidly is complicated to explain.