The system of checks and balances is integral to the functionality of the United States government. Learn more about the ways the three branches of the government work together—and about the limitations of their power—with an informative...

So many US Constitution clauses, so little time. The 17th installment in a 20-part series teaches pupils about the Third, Fourth, and Fifth Amendments. Learning through activities such as group work, connecting to current events, and...

Your young historians will read excerpts from three parts of the United States Constitution—Article One, the Thirteenth Amendment, and the Fourteenth Amendment—and discuss how they each address the issue of slavery. 

Entropy, it isn't what it used to be. Presentation includes kinetic-molecular theory, heat and internal energy, thermal equilibrium, temperature scales, laws of thermodynamics, entropy, latent heat of fusion, specific heat, calorimetry,...