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So let's start and let's go to April 1667.

So April 1667 is about 20 years after Galileo had died.

And it was about this time that Newton was making his important discoveries,

which would only be published 20 years later.

So that you situate yourselves, you know, where we are in history.

And in that month, April 67,

Nicholas Steno published a book where he argued, arguably for the first time, that stones found in drylands, which we call fossils today, were actually teeth of shark.

Now, this discovery triggered what became his famous geological career, leading him to claim not only that the Earth has a history, but also that history can be known through a series of principles, today known as Steno's Laws of Stratigraphy, and because of, he is known in certain circles as the founder of modern geology.

Now, what is interesting about this book is that if you go to the front cover, you know, the title of the book has nothing to do with geology.

It is called a sample of the elements of myology.

So, myology being the study of muscles. He was an anatomist. He was writing a book about anatomy.

But again, if you flip through most of the pages of this book, you won't find much that

look like an anatomy book, and instead you find this.

And you see that it is a book filled with lemmas, definitions, corollaries, and many, many diagrams.

So it looks like Euclid's elements in many ways.

And not only that, it was also in this book that he made one of his most important anatomical discoveries,

namely saying that women had ovaries.

Until this time, many people called what we call today ovaries as female testicles.

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