For example, the hard part of your bones and teeth is made from calcium connected to a chemical called “phosphate”. Together, they make the substance, calcium phosphate. Sidewalk chalk is made from ...
For example, hermit crabs, which inhabit second hand shells and change to newer, bigger shells as they grow, have the ability to recognise shells suitable for occupation not only by feeling for them, ...
Tiny, solid windows in the shells of heart cockles let in light for the photosynthetic algae inside them – and they could show us how to make better fibre-optic cables ...