Skeleton Keys Quotes

“What exactly is bone tissue? What makes it different from other stiff organic materials, such as the tough chitin of a blue crab’s shell? From a biochemical perspective, bone—in La Brea’s skeleton, in yours, and in any other vertebrate’s body—is pretty simple. It’s a combination of two different materials: a protein part called collagen and a mineral part called hydroxyapatite.”
― Brian Switek, Skeleton Keys: The Secret Life of Bone