Browse "Science & Technology"

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David Dunlap Observatory

David Dunlap Observatory, see OBSERVATORY.
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Article

David H. Hubel

David Hunter Hubel, FRS, Nobel Laureate, neurobiologist (born 27 February 1926 in Windsor, ON; died 22 September 2013 in Lincoln, Massachusetts). Dr. David Hubel advanced our understanding of how our eyes transmit and reconstitute the images we see moment by moment to our brains. He was a research scientist who used innovative craftsmanship to design and create the instruments and procedures he used to conduct studies on the visual cortex of the brain. His meticulous observations revolutionized cognitive neuroscience and his pioneering approach to the recording of individual neuronal cells propelled the field forward.
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Article

Dawson Archaeological Site

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.
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Article

De Havilland Canada DHC-2 Beaver

The de Havilland Canada DHC-2 Beaver, successor to the Noorduyn Norseman, was the all-purpose bush plane of the Canadian North. (See also Bush Flying in Canada.) The Beaver was sturdy, reliable and able to take off and land on short lengths of land, water and snow. It has been called the best bush plane ever built. While de Havilland Canada produced it for only 20 years — from 1947 to 1967 — many Beaver planes still fly today. The Beaver helped connect communities in remote areas of Canada, in addition to serving across the globe.
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Article

de Havilland Caribou

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.
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de Havilland Dash 7

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
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Article

de Havilland Otter

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

Deafness

See HEARING LOSS; DEAF CULTURE.
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Article

Death

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.
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Article

Death and Dying

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.
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Article

Deep Rover

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.
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Article

Dentistry

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.
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Article

Department of Communications

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

Depression

Depression, see GREAT DEPRESSION.
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Macleans

Depression

This article was originally published in Maclean’s magazine on December 1, 1997. Partner content is not updated. 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.
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