- 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.
- Bald Hill (Snohomish County, Washington) (Wikipedia)
Bald Hill is a 737-foot (225 m) hill in Snohomish County, Washington. The Skykomish River once flowed north of the hill but at some point in recent geologic history was diverted to its present course on the south side of the hill, moving the confluence with the Snoqualmie River (creating the Snohomish River) several miles upstream. In 1952, most of Bald Hill and adjacent Devils Butte were Washington State Forest land. As of 2016, Devils Butte is part of Lord Hill Regional Park, and the Bald Hill area was still listed by Washington State Department of Natural Resources as State Forest Trust, formerly Forest Board Trust land.