From Flight to Discovery with Alexander Graham Bell’s Papers

It didn’t occur to me until recently that my math lesson was missing a primary source. After a simple search for “tetrahedron” or “tetrahedral kites” on the Library of Congress Web site, I was fascinated to find primary sources that could have enriched my geometry and measurement lessons.

The Dust Bowl: An Iconic Catastrophe

Decades after the drought and depression of the 1930s ended, images of the Dust Bowl are still familiar to millions of people worldwide. These images, and the stories and songs that emerged at the same time, are powerful tools for exploring the history and legacy of this nation-changing disaster.