Smithsonian Institution
Trait Tracker
Help mice beat the odds with an exciting activity about traits. Biologists discover the role of diet and other factors on animal traits by participating in a simulation activity. Teams collect and evaluate data to understand how certain...
Curated OER
Mixed Frequency Signals
In this electrical worksheet, students interpret schematics to answer a series of 31 questions about mixed frequency signals. This worksheet is printable and the answers are available on-line.