Best Museums In The USAAmerica has many of the world's greatest museums, some of which are free.
Smithsonian Navigates History From Galileo To GPSIn the age of hand-held GPS devices, navigating by the stars may seem quaint and irrelevant. So it may come as a surprise that it took hundreds of years to develop the tools needed to find our way across oceans, through the air and into deep space.

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