- Fort Flagler (wa100.dnr.wa.gov)
History buffs know that western Washington has not only a rich natural history, but also a military history that spans more than a century. Fort Flagler State Park is a piece of Washington’s historical first line of defense against maritime threats to metropolitan areas of Puget Sound. The fort was constructed in 1897 and was active until 1953. Many of the fort’s original buildings and artillery batteries are remarkably well preserved and free to explore, and several of the original officers’ houses can be rented for the night. In the summer, visitors can also take a volunteer-guided tour of the gun emplacements and other historic sites for a small donation. Perched on high bluffs and surrounded on three sides by water, the park offers panoramic views as well as a perfect vantage point for observing ship traffic into and out of Puget Sound.
- Real number (Wikipedia)
In mathematics, a real number is a number that can be used to measure a continuous one-dimensional quantity such as a distance, duration or temperature. Here, continuous means that pairs of values can have arbitrarily small differences. Every real number can be almost uniquely represented by an infinite decimal expansion.