- Skagit Headquarters Wildlife Area Unit (wdfw.wa.gov)
The Skagit Headquarters Unit is tidal marsh (estuary) on Fir Island, west of and adjacent to Freshwater Slough. The unit is predominantly vegetated by cattail and sedge and used extensively by waterfowl and other waterbirds, shorebirds, raptors, and passerines.
- Infinitesimal (Wikipedia)
In mathematics, an infinitesimal number is a non-zero quantity that is closer to 0 than any non-zero real number is. The word infinitesimal comes from a 17th-century Modern Latin coinage infinitesimus, which originally referred to the “infinity-eth” item in a sequence.