- Grant County, Washington has 2,679.5 square miles of land area and is the 4th largest county in Washington by total area. Grant County, Washington is bordered by Kittitas County, Washington, Adams County, Washington, Lincoln County, Washington, Franklin County, Washington, Douglas County, Washington, Yakima County, Washington, Okanogan County, Washington, and Benton County, Washington.
- Leonhard Euler (Wikipedia)
Leonhard Euler (/ˈɔɪlər/ OY-lər, German: [ˈleːɔnhaʁt ˈʔɔʏlɐ], Swiss Standard German: [ˈleːɔnhart ˈɔʏlər]; 15 April 1707 – 18 September 1783) was a Swiss mathematician, physicist, astronomer, geographer, logician, and engineer who founded the studies of graph theory and topology and made pioneering and influential discoveries in many other branches of mathematics such as analytic number theory, complex analysis, and infinitesimal calculus. He introduced much of modern mathematical terminology and notation, including the notion of a mathematical function. He is also known for his work in mechanics, fluid dynamics, optics, astronomy, and music theory.