the first thing i'm going to be talking about is the manuscript by galileo galilee, a very notable scientists, often credited with inventing the telescope. he didn't really infante. what he took was the telescope and improved it. so he could see things that no one else could be. what i'm going to show you first is the manuscript at the university of michigan owns. this manuscript is just one page. it's written only on one side and it is basically a piece of scratch paper. to me, it wasn't some name that he carefully thought out. it wasn't a spanish project. it's really where you can see is my network. the manuscript itself is divided by line in the center. that line represents two different types use this piece of paper. the first half, the top half of the piece of paper he used in the summer of 1609. apparently he had heard there was a man from the netherlands, who is trying to have an instrument maker himself. he could certainly build one of those. and so he did. he sat down and built one. he did it in one night. they've taken longer than that. in fact, you don't build a telescope and large