Khan Academy
Khan Academy: Us History: 1890 1945: The New Deal
When Franklin Delano Roosevelt took office in 1933, he enacted a range of experimental programs to combat the Great Depression.
TeachEngineering
Teach Engineering: Sound From Left or Right?
Why do humans have two ears? How do the properties of sound help with directional hearing? Students learn about directional hearing and how our brains determine the direction of sounds by the difference in time between arrival of sound...
Smithsonian Institution
National Portrait Gallery: Eye Contact: Modern American Portrait Drawings
Portraits in the collections of the National Portrait Gallery can be seen and understood with excellent gallery notes that also survey the history of portraiture in American art leading up to the modern period.