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Two illustrations of the moon showing a jagged line down the center. The top illustration has the line almost exactly in the middle and the bottom illustration has the line slightly to the left. To the left of the lines the moon is dark and to the right of the lines the moon is light.

Sidereus Nuncius

Galileo Galilei began a scientific revolution when he shared a new way of studying the universe in his book Siderius Nuncius.

Overview: Prosperity for All?

America was founded on the principles of equality, freedom, liberty, and respect for individual rights. But these ideals have not always applied to everyone, and many Americans have fought since the founding of this country to broaden those values so that they apply to all Americans.

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