Amines are vital to humans because they help form amino acids, the building blocks of proteins. The 30th lesson in a series of 36 specifically focuses on the organic compounds that contain nitrogen. Learners classify amines and nitro...

As part of a study of post Civil War era, young historians investigate the changes in voting rights during the Reconstruction Era (1863-1876), the fraud involved in the Hayes-Tilden presidential election of 1876, and efforts by Pap...