If our students are to become engaged citizens, they must learn to ask questions about accuracy, credibility and bias, and to reflect on their own biases.

The featured letter from an emancipated slave to his former master illuminates the historical transition from slavery to freedom and is an excellent resource for classes in both history and literature.

Following up on an earlier column, the author highlights Internet-oriented resources as well as companies, not-for-profits, and government agencies that exhibited at December's NCSS conference in San Diego.

The two featured 16th-century maps of the Americas can launch a classroom inquiry into the distinct goals that cartographers have when creating a map.