Before digital microscopes, scientists hired artists to draw the things visible in the microscope. Through training in neuroscience and art, Cajal revolutionized the way we view the beautiful brain. The third lesson in a series of four...

Study and compare multiple aspects of both Aztec and Inca civilizations. Young historians explain how each of the empires came to be, and how they were both defeated by the Spanish. The resource starts out as a good lesson, but is...