lewis and clark trail state park of
- Calculus (Wikipedia)
Calculus is the mathematical study of continuous change, in the same way that geometry is the study of shape, and algebra is the study of generalizations of arithmetic operations.
- Touchet River (Wikipedia)
The Touchet River /ˈtuːʃi/ is a 65-mile (105 km) tributary of the Walla Walla River in southeastern Washington in the United States. The Touchet River drains an area of about 752 square miles (1,950 km2) in Columbia County and Walla Walla County.