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Data collected in the field are considerably refined and condensed. Only a representative set including all critical information, such as the least depth over shoals, appears on the published chart. Typically, there is a scale reduction of 2-4 times from the field document to the chart.

Illnesses that this infection can produce include a transient disease, developing within several months of exposure. It is characterized by rash, fever, malaise, joint pains and lymphadenopathy (swollen lymph nodes).

Air Profile Recorder (APR), a narrow-beam recording radar altimeter designed to provide topographic profiles for use in the mapping of wilderness areas. The instrument employs a 3.2 cm pulse transmitter that feeds a parabolic radiator, mounted below the aircraft.

Air Traffic Control (ATC) is the service provided to pilots to assist them in operating their aircraft in a safe, orderly and efficient manner.

The first bush plane of all-Canadian origin, Noorduyn Norseman was designed after consultations with bush pilots and built in Montréal by R.B.C. (Bob) Noorduyn. It was a rugged, single-engined craft, with the large

The railway was designed to link the 3 lakes for which it was originally named - the Ontario, Simcoe and Huron Railway. It opened in May 1853 when the locomotive Toronto (made in Toronto) hauled the first steam train in present-day Ontario from Toronto to Machell's Corners (present-day Aurora).

An aquarium is an organization devoted to the public exhibition of both freshwater and marine aquatic life. Exhibit species may include not only fish but also other aquatic animals.

A herbarium (Lat herba, "herb," formerly any medicinal plant) is a collection of dried specimens of plants mounted on sheets of heavy paper and stored in cabinets or bound in book form, as well as the building that houses such a collection.

Calèche, French word used in Canada for a light, 2-wheeled carriage drawn by a single horse, with a folding hood and seats for 2 passengers with another for the driver on the splashboard.

Potash is an alkaline potassium compound most commonly used in fertilizers. It refers to a variety of salts produced through mining of minerals and chemical manufacturing. Canada is the world's largest potash producer and exporter.

Schizophrenia is an illness of the mind that affects 1 percent of the world's population, including 1percent of Canada's population. It is one of the most serious and debilitating mental illnesses because at present there is no cure, and it can be very difficult to treat.

Asthma is a chronic inflammatory disease of the lungs that is marked by recurring episodes of airway obstruction. It is one of the most prevalent chronic conditions affecting Canadians. Asthma often begins in childhood, but initial onset can occur at any age.

The Natural Sciences and Engineering Research Council (NSERC), established in 1978, is the federal government instrument for strategic investments in Canadian science and technology.

Human biological history is most directly told by the fossil record. Although early hominid remains (fossils in the human line) are not found in the Western Hemisphere, Canadians have contributed significantly to paleontology.

Sanofi Pasteur Limited, formerly known as Connaught Laboratories Limited of Toronto, is the leading supplier of vaccines in Canada. The parent company is Sanofi Pasteur, one of the world's largest manufacturers of vaccines and a division of Sanofi-aventis, a diversified pharmaceutical company.

Direct-to-home (DTH) satellite broadcasting is a form of SATELLITE COMMUNICATION which offers consumers significantly more entertainment options than those offered by local cable companies.