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4min chapter
Shells
SciShow Tangents
The Secrets of the Spiral
There's an advantage to having like the internal structure of a spiral thing that makes it really strong. The way that these shells get made is they're secreted over time. Sam offers a guess at why and then Sarah's got a how for us. And I'll like those three factors of secreted mostly calcium carbonate and a little tiny bit of protein in mathematical models can make all kinds of different spiral shaped shells.
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