The United States of America is a complex nation with a long and fascinating history that could never be captured in a single image.

The president posted an edited image showing the U.S. flag over Canada, Greenland and Venezuela in meeting with European leaders.

Holly has a degree in Medical Biochemistry from the University of Leicester. Her scientific interests include genomics, personalized medicine, and bioethics.View full profile Holly has a degree in ...

The Cooperative National Geologic Map offers a complete and detailed look at the bedrock and fault systems of the continental United States. The first geological map of the United States was published ...