Lengthy article on the Second Industrial Revolution in the United States. Looks at the growth of businesses into corporations with large workforces and manufacturing facilities, and the labor issues and organizations that arose as...

Learn more about the motion of objects through this resource. This site features a teacher's guide and activity sheet.

Based off of the hit television show NUMB3RS, this lesson has students develop the concept of pursuit curves, in which one object moves according to the movements of another object. This lesson is framed in the context of an officer...

"South China comprises the drainage basins of the middle and lower Yangtze River, the basin of the His Chiang (West River) in Kwangtung and Kwangsi; and the mountainous coastal provinces of Fukien and Chekiang. The division between the...

George Armstrong Custer, a brilliant cavalry officer, was born at New Rumley, Ohio, December 5, 1839. He graduated at West Point, in 1861, and at once engaged in active service, being in the Bull Run battle. Throughout the war, it is...