In 1666, a young Danish scientist held a shark's tooth in one hand and a ancient stone in the other --- and felt something shift. Nicolas Steno, physician to the Medici court, would go on to found modern geology and give humanity the radical idea that the Earth itself has a history, written in layers of rock and time. But Steno's story is about more than stratigraphy. It's about a man who never confused the domain of science with the domain of the heart --- who read the rocks with the same honest attention he brought to questions of faith --- and who showed us that truth is one thing, and we have more than one way of finding it.

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