Why don’t we all turn to stone?

Medusa by CarvaggioIn Greek mythology, Medusa could turn people to stone by simply looking at them. Of course, we are all part stone: our bones contain a mineral called hydroxyapatite that makes them strong enough to bear our weight. This mineral is a form of calcium phosphate. It is highly insoluble, which is good, we don’t want our bones dissolving on us.

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