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Newcomen, Thomas

(Encyclopedia) Newcomen, Thomas nyoo´kmn, nyookm´n, 1663–1729, English inventor of an early atmospheric steam engine (c.1711). It was an improvement over an earlier engine patented (1698) by…

Mérida

(Encyclopedia) Mérida m´rä, city (1990 pop. 523,422), capital of Yucatán state, SE Mexico. It is the chief commercial, communications, and cultural center of the Yucatán peninsula. Founded (1542)…

Grand Coulee Dam

(Encyclopedia) Grand Coulee Dam koo´l, 550 ft (168 m) high and 4,173 ft (1,272 m) long, on the Columbia River, N central Wash., NW of Spokane; built 1933–42 as a key unit in the Columbia basin…

white-eye

(Encyclopedia) white-eye, common name for warblerlike, arboreal birds, including 85 species in the family Zosteropidae, and for certain species of ducks. The members of Zosteropidae, with the…

What is an “exotic” fish?

Source: National Marine Fisheries Services' Northeast Fisheries Science Center     The most often quoted estimate is 20,000. There may be as many as 20,000 more. Which is the oldest type of…

hydraulic machine

(Encyclopedia) hydraulic machine, machine that derives its power from the motion or pressure of water or some other liquid. Hydraulic Engines Water falling from one level to a lower one is used to…