Science & Technology | The Canadian Encyclopedia

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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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  • Article

    Diabetes

    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.

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  • Article

    Diamond

    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.

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  • Article

    Dietetics

    Dietetics (from the Greek diaita, meaning "mode of life") has been implicated in the cause, cure and prevention of disease from earliest recorded history.

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  • Article

    Canada and the Digital Economy

    The digital economy is the economic activity conducted through digital technologies such as the Internet. It is also called the Internet economy, the new economy or the web economy. Many scholars see the digital economy as the fourth industrial revolution. As of 2013, it consumed approximately 10 per cent of the world’s electricity. Many of the world’s biggest companies operate in the digital economy. A growing number of Canadians depend on it for their livelihood. In 2017, nearly 5 per cent of all jobs in Canada were in the digital economy. The gross domestic product (GDP) connected to it represented 5.5 per cent of Canada’s total economy — a bigger percentage than mining or oil and gas extraction. However, the often-hidden infrastructure of the digital economy brings new threats to the environment. The rise of cryptocurrencies could also dramatically change how people buy and sell things.

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  • Article

    Dioxine

    The term dioxin applies to any of 75 chlorinated derivatives of dibenzo-p-dioxin. The various types of dioxin are quite different from one another, the greatest difference being in their toxicity.

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  • Article

    Direct-to-home Satellite Broadcasting

    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.

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