- Normandy Park — Thumbnail History (historylink.org)
The town of Normandy Park is located in King County, on the shores of Puget Sound between the cities of Des Moines and Burien. Native American tribes traveled to the area to gather clams on the area beaches and fish for salmon. A few families established themselves in the region late in the nineteenth century, but it wasn’t until the 1920s that the Seattle-Tacoma Land Company began selling lots to develop the city of Normandy Park – so named due to the French Norman architecture of the new homes. Population grew steadily after the Depression ended, and Normandy Park established a reputation for prosperity and exclusivity, due to the private beach access afforded only to certain residents. Normandy Park had bumpy political maneuverings in the 1980s and 1990s, and in 2012, city layoffs that resulted in a property tax levy for residents. The city’s population had reached 6,335 by 2010.
- Klein bottle (Wikipedia)
In mathematics, the Klein bottle (/ˈklaɪn/) is an example of a non-orientable surface; that is, informally, a one-sided surface which, if traveled upon, could be followed back to the point of origin while flipping the traveler upside down. More formally, the Klein bottle is a two-dimensional manifold on which one cannot define a normal vector at each point that varies continuously over the whole manifold. Other related non-orientable surfaces include the Möbius strip and the real projective plane. While a Möbius strip is a surface with a boundary, a Klein bottle has no boundary. For comparison, a sphere is an orientable surface with no boundary.