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Cryptozoology is the scientific study of unknown animals about which only circumstantial, or at best insufficient, material evidence is available.

CTrain is a light rail transit system in Calgary, Alberta. It is operated by Calgary Transit, a public transit service owned by the City of Calgary and operated through its Transportation Department. Service began on the initial downtown transit corridor and south line in 1981. It expanded to northeast Calgary in 1985, to the University of Calgary in the city’s northwest in 1987 and to the city’s west side in 2012. Most of its route and stations are at surface level. Calgary Transit operates the CTrain in conjunction with an extensive network of bus routes. Through equivalency purchases of wind-generated electricity, it has been entirely wind-powered since 2001. Its two separate lines comprise 45 stations, 118.1 km of track, and an average daily ridership of 312,300 (2018).

Cystic Fibrosis Canada is a national, nonprofit, voluntary health agency established 15 July 1960. Cystic fibrosis is a disorder that occurs when a child inherits 2 genes for the condition, one from each parent.

 For those researchers working in the field of human history, the chronology of events remains a major element of reflection. Archaeologists have access to various techniques for dating archaeological sites or the objects found on those sites.

David Dunlap Observatory, see OBSERVATORY.

The Dawson site is an ancient Iroquoian village located on the Island of Montréal, next to Mount Royal. The site, which was initially located on a sand dune, covers about two acres.

De Havilland Beaver, DHC-2, successor to the NOORDUYN NORSEMAN as the all-purpose bush plane of the Canadian North. Its specifications were based on results of a questionnaire circulated by "Punch" DICKINS , and it

De Havilland Caribou, DHC-4, twin-engined STOL aircraft capable of taking off in only 220 m. It was characterized by the sharp upward angle of the rear fuselage, providing access for large loads. It first flew July 1958, and was used mostly in a military role.

De Havilland Dash 7, DHC-7, STOL aircraft designed for efficient transport from city centres. It first flew March 1975 after a long development costing $120 million, four-fifths of which was paid by the federal government. Its

By the mid-1950s de Havilland realized the need for a larger, more powerful version of the DHC-3.

See HEARING LOSS; DEAF CULTURE.

For centuries the law has accepted the cessation of heartbeat and respiration as the determination of death, but now the heart can be removed, the breathing stopped and blood pumped by machines without preventing the individual's resumption of lucid consciousness.

Death, the irreversible cessation of life, has always intrigued and frightened mankind. Every known culture has attempted to provide an explanation of its meaning; like birth or marriage it is universally considered an event of social significance, amplified by ritual and supported by institutions.

A one-man submersible capable of working 4-6 hours under water to a depth of 914 m at speeds up to 1.5 knots, Deep Rover was designed by Graham Hawkes at San Leandro, Calif, and built by Can-Dive Services Ltd of Vancouver and in Dartmouth, NS, in 1984 to work in the offshore oil industry.

Dentistry is the art of the treatment of teeth and their supporting tissues. The Egyptians, in their papyri dating back to 3500 BC, described dental and gingival ("of the gums") maladies and their management, and evidence of teeth restoration has been found in Egyptian mummies.

The Department of Communications was established by the Department of Communications Act in 1969.

The first serious bout was back in 1963, when he was attending Queen's University and, just before final exams, locked himself in his dorm room for two weeks.

Depression, see GREAT DEPRESSION.

Diabetes mellitus, commonly referred to as diabetes, is a disease in which the body either produces insufficient amounts of insulin or cannot use insulin properly.

Gem-quality diamonds crystallize as octahedrons (8 faces), trisoctahedrons (24 faces), hexoctahedrons (48 faces) or a combination of these. Diamond owes its supreme standing among all the gemstones to 4 specific attributes.