Delve into the Age of Exploration with this activity-packed resource! Complete with a pre-test, discussion questions and quiz for a 30-minute video on the period, map activities, timeline of discoveries, vocabulary, etc. this is a...

From the start of the Industrial Revolution, it only took 147 years for someone to invent plastic. This may seem like a long time, but in the history of inventing or discovering new materials, this is incredibly fast. An informative and...

Every major concept, key term, and definition that an AP US history student should know for a test prep session and the big exam is right here in this comprehensive, well-organized study guide. 

This site from PBS details the history of radio and KDKA (Pittsburgh, Pennsylvania) the first radio station to offer programming. Mentions: advertising, NBC Radio, mass culture.

This site examines the black hole as an object in astrophysics. Delve into this comprehensive resource that covers this concept from its history, to qualitative physics, the reality of black holes, mathematical physics and more.