Cuttlebone's microstructure sits at a 'sweet spot'

Cuttlebone's microstructure sits at a 'sweet spot'

5:05 PM
A professor has a lesson in one of his mechanical engineering courses on how brittle materials like calcium carbonate behave under stress. In it, he takes a piece of chalk composed of the compound and snaps it in half to show his students the edge of one of the broken pieces. The break is blunt and straight.

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