A heavily enlarged 3-D print of the sea urchin shell in cross section reveals the secret to the immense strength of the calcium shell of the sea creature. Dirk Müter, Assistant Professor at the ...
Gardener with basket of egg shells spreading crushed shells around tomato plant - VH-studio/Shutterstock A quality eggshell contains about 2.2 grams of calcium carbonate, the compound that gives them ...
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