A timeline with primary source documents and photos of the invention and use of the atomic bomb during World War II. Links to additional information and videos are also provided.

This is a site full of information about various microscopes and the objects and processes scientists study with them. Includes timelines and interactive simulations.

How many native English speakers are there in the world today? Learn important facts and statistics about the English-speaking world as well as a history of the language from its Germanic beginnings to the present.

Peruse this timeline of the Great Depression and gather information about this era in United States History. Short, interesting paragraphs summarize U.S. and world events with an emphasis on economic issues.