Science & Technology | The Canadian Encyclopedia

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  • Macleans

    QLT PhotoTherapeutics

    Strange things were happening to Philip Watts. When he woke in the morning he noticed a spray of brown markings on his pillow, which at first looked like coffee grounds. He soon realized they were caused by blood.This article was originally published in Maclean's Magazine on February 1, 1999

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  • Article

    Quarantine Act

    Canada adopted quarantine legislation in 1872, five years after Confederation. It was replaced by the current Quarantine Act, which was passed by the Parliament of Canada and received royal assent in 2005. The act gives sweeping powers to the federal health minister to prevent the introduction and spread of communicable diseases. These powers can include health screenings, the creation of quarantine facilities and mandatory isolation orders. The Quarantine Act was introduced in the wake of the severe acute respiratory syndrome (SARS) crisis of 2003. It was invoked in March 2020 in response to the COVID-19 pandemic.

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  • Article

    Quasar

    Quasar, a point-like astronomical object which radiates over a wide spectral range. Although the name is a contraction of a "quasi-stellar radio source", these objects also emit light, x-rays and even gamma rays.

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  • Article

    Quaternary Vertebrate Fossils

    Mountainous zoneThe unglaciated areas of the Yukon Territory within the Cordilleran part of the mountainous zone contain the most productive Pleistocene (about 2 million to 10 000 years ago) VERTEBRATE fossil localities in Canada.

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  • Macleans

    Quebec and the High Cost of Smoking

    This article was originally published in Maclean’s magazine on October 25, 1999. Partner content is not updated. In the waning light of a brisk October evening in Quebec City, patrons flock to a bar in a yuppie neighbourhood near the Plains of Abraham. Inside, Sarah McLachlan's sensual voice spills out of the sound system.

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  • Article

    Queen Elizabeth Way

    Queen Elizabeth Way, connecting Toronto with Niagara Falls and Fort Erie, Ont, was Canada's first 4-lane, controlled-access superhighway.

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  • Article

    Radar

    Radio waves are part of the electromagnetic spectrum, as is visible light. H.R. Hertz provided practical demonstration of Maxwell's theory and, in 1888, actually performed radio-wave-reflection experiments.

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  • Article

    Radium

    Radium (Ra) is a rare radioactive metal found with naturally occurring URANIUM (about 1 part radium to 3 million parts uranium). It was discovered in 1898 by Pierre and Marie Curie and G.

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  • Article

    Raft

    Once the spring timber drive reached the main rivers, the timber was assembled into rafts for transportation to the shipping port.

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  • Article

    Railway Safety

    One of the most famous railway accidents in recent years was the 1979 "Mississauga Derailment". There were no injuries, but the accident involved leaking chlorine cars and forced the evacuation of 250 000 nearby residents.

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  • Article

    Recorded sound production

    The first recordings made in Canada were those made 17 May 1878 by the Governor-General, Lord Dufferin, and his guests at Rideau Hall in Ottawa. On 17 May 1878 Lady Dufferin wrote in her diary (My Canadian Journal 1872-1878, Toronto 1969, p 292): 'This morning we had an exhibition of the phonograph.

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  • Article

    Recorded Sound Technology and its Impact

    From the beginning, sound recording offered the consumer an unprecedented access to musical sound - an access virtually uninhibited by the constraints of skill, time, place, and social standing.

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  • Article

    Regional Development Planning

    Regional Development Planning is undertaken by governments with the aim of improving the well-being of people in areas where there is concern about present and future living conditions.

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  • Article

    Remote Sensing

    History The oldest remote sensing instrument is the photographic camera, which has a long history of use in making observations of Earth from aircraft and, more recently, spacecraft.

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  • Article

    Rideau Canal

    Rideau Canal (or Waterway), 202 km long, links the Ottawa River at Ottawa with Lake Ontario at Kingston.

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