Collecting shells was a common past time in Enlightenment Britain, when elite women were becoming increasingly interested in science.
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Articles on sea shells
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Molluscs that have shells - like pipis, clams and oysters - have to build their own shell from scratch. And they keep building it their whole life, using chemicals from the sea and their own bodies.
The four ingredients for holy incense are listed in the Old Testament, but there was much debate over the origin of one of them – onycha. Scientists think they’ve now confirmed the source.
