All mollusks build their own shells, whether they live in water or on land. Creatures like snails, clams, oysters and mussels use an organ called a mantle to secrete layers of calcium carbonate ...

You might have seen your fair share on trips to the seaside or being toted around your garden by snails, but that's just the tip of the iceberg. You can grab a copy of Interesting Shells from the ...

In brief: they've grown thicker shells. The paper documents two sets of field experiments, conducted 20 years apart, ...