Science & Technology | The Canadian Encyclopedia

Browse "Science & Technology"

Displaying 376-390 of 847 results

  • Macleans

    Hormone Replacement Therapy Controversy

    It was a flashpoint in the long, hot debate about how to treat menopause symptoms. Last week, the U.S.This article was originally published in Maclean's Magazine on July 22, 2002

    "https://www.thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9" // resources/views/front/categories/view.blade.php
    https://www.thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9 Hormone Replacement Therapy Controversy

  • Article

    Hospital

    The first HÔTEL-DIEU in New France was established in 1639 by 3 sisters of Augustines de la Miséricorde de Jésus in Québec City. This hospital is still in operation.

    "https://d3d0lqu00lnqvz.cloudfront.net/media/media/a4480ae5-7341-492f-87ed-8ad68a495cc6.jpg" // resources/views/front/categories/view.blade.php
    https://d3d0lqu00lnqvz.cloudfront.net/media/media/a4480ae5-7341-492f-87ed-8ad68a495cc6.jpg Hospital

  • Article

    Hospital Architecture

    From the 17th century until about 1900, hospitals in what is now Canada were unspecialized, multi-purpose institutions for the sick poor. Until around 1900 those able to pay doctors preferred to be treated at home. The first hospitals emerged in places where people were unable to get medical treatment by physicians in their own homes. The financial sources and social mandates of hospitals have varied widely over the past 400 years. The earliest hospitals included military and marine hospitals, as well as Roman Catholic and then Protestant benevolent institutions. By the turn of the 20th century, the administration of scientific medicine was the major purpose of the Canadian hospital. Since about 1970, hospitals have become increasingly specialized; structurally they have become flexible and expandable.

    "https://d3d0lqu00lnqvz.cloudfront.net/emmanuelpersillierlachapelle/notredramehospitalonsherbrooke.jpg" // resources/views/front/categories/view.blade.php
    https://d3d0lqu00lnqvz.cloudfront.net/emmanuelpersillierlachapelle/notredramehospitalonsherbrooke.jpg Hospital Architecture

  • Macleans

    HRT Conundrum

    Nicole Mitchell seems visibly relieved to have found someone to listen as she runs through her list of menopause symptoms.This article was originally published in Maclean's Magazine on January 12, 1998

    "https://www.thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9" // resources/views/front/categories/view.blade.php
    https://www.thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9 HRT Conundrum

  • Article

    Human Genome Project

    GoalsAlthough the formal goal is to describe the sequence of nucleotides in the total length of DNA in the nucleus of a human cell, genes themselves are in fact very sparsely scattered within the DNA strand.

    "https://d3d0lqu00lnqvz.cloudfront.net/media/media/603e45e5-1f43-48a4-acbb-5735f60584ed.jpg" // resources/views/front/categories/view.blade.php
    https://d3d0lqu00lnqvz.cloudfront.net/media/media/603e45e5-1f43-48a4-acbb-5735f60584ed.jpg Human Genome Project

  • Article

    Humboldt Broncos Bus Crash

    One of Canada’s most high-profile highway tragedies occurred on 6 April 2018, when a bus carrying 28 members of the Humboldt Broncos junior hockey team collided with a transport truck at a highway intersection near Tisdale, Saskatchewan. The crash killed 16 team members: 10 players and 6 staff. It also led to new truck-driver training and licensing regulations and increased awareness about the availability and use of seat belts among bus passengers.

    "https://d3d0lqu00lnqvz.cloudfront.net/media/single_use_images/20202768_lg.jpg" // resources/views/front/categories/view.blade.php
    https://d3d0lqu00lnqvz.cloudfront.net/media/single_use_images/20202768_lg.jpg Humboldt Broncos Bus Crash

  • Article

    Humidity and Humidex

    Humidity is related to the amount of moisture or water vapour in the air. Although invisible, water vapour is always present in the atmosphere. 

    "https://www.thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9" // resources/views/front/categories/view.blade.php
    https://www.thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9 Humidity and Humidex

  • Article

    Hydroelectricity in Canada

    Hydroelectricity is energy produced from flowing water. The amount of energy produced depends on volume and speed: the more water moving at a fast rate, the more energy produced. For this reason, many hydroelectric stations are built near waterfalls. To produce energy, water is directed toward turbines — sometimes with the help of a dam — causing them to spin. In turn, the turbines make electrical generators spin and electricity is produced. It is a renewable, comparatively nonpolluting energy source and Canada’s largest source of electric-power generation.

    "https://d3d0lqu00lnqvz.cloudfront.net/media/media/0c8c9180-7dde-40c3-9b85-fcd031a4d8c4.jpg" // resources/views/front/categories/view.blade.php
    https://d3d0lqu00lnqvz.cloudfront.net/media/media/0c8c9180-7dde-40c3-9b85-fcd031a4d8c4.jpg Hydroelectricity in Canada

  • Article

    Hydrofoil

    Attempts to create a hydrofoil were made in England as early as 1861. A hydrofoil sustains its motion by the lift achieved by hydrofoil-plates that function in the water as airplane wings do in the air.

    "https://d3d0lqu00lnqvz.cloudfront.net/media/media/6cecea23-75d7-45b5-b758-2f53a1b5bce7.jpg" // resources/views/front/categories/view.blade.php
    https://d3d0lqu00lnqvz.cloudfront.net/media/media/6cecea23-75d7-45b5-b758-2f53a1b5bce7.jpg Hydrofoil

  • Article

    Hydrogen

    Hydrogen (H), the simplest, lightest and most abundant chemical element, is the main fuel for the nuclear fusion reactions which power the sun.

    "https://www.thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9" // resources/views/front/categories/view.blade.php
    https://www.thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9 Hydrogen

  • Article

    Hydrography

    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.

    "https://d3d0lqu00lnqvz.cloudfront.net/media/media/4aad02e3-72bd-400c-87ab-d1380ccad4dc.jpg" // resources/views/front/categories/view.blade.php
    https://d3d0lqu00lnqvz.cloudfront.net/media/media/4aad02e3-72bd-400c-87ab-d1380ccad4dc.jpg Hydrography

  • Article

    Hydrology

    Quantitative measurements of rainfall, snowfall, the rate at which water penetrates into and moves through soil, streamflow, the rise and fall of LAKE and GROUNDWATER levels, and the evapotranspiration of water into the atmosphere are vital.

    "https://www.thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9" // resources/views/front/categories/view.blade.php
    https://www.thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9 Hydrology

  • Article

    Ice Age

    Ice Age, the Pleistocene epoch of geologic time, during which periodic, extensive glacial activity occurred in many parts of the world.

    "https://www.thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9" // resources/views/front/categories/view.blade.php
    https://www.thecanadianencyclopedia.ca/images/tce_placeholder.jpg?v=e9dca980c9bdb3aa11e832e7ea94f5d9 Ice Age

  • Article

    Icebreakers

    Icebreakers were first used in the Canadian Arctic in the 1920s to deliver supplies and services to Native and isolated settlements during the short summer season, and to back up claims of Canadian sovereignty over the NORTHWEST PASSAGE and ARCTIC ARCHIPELAGO.

    "https://d3d0lqu00lnqvz.cloudfront.net/media/media/737e507c-57e6-4b84-9ef9-d68151cd83af.jpg" // resources/views/front/categories/view.blade.php
    https://d3d0lqu00lnqvz.cloudfront.net/media/media/737e507c-57e6-4b84-9ef9-d68151cd83af.jpg Icebreakers

  • Article

    IMAX Systems Corporation

    IMAX emerged from the Expo 67 cultural context. Corporation co- founders Graeme Ferguson, Roman Kroitor and Robert Kerr all participated in some of the popular large- and multiple-screen film experiments that were part of the Montréal Expo.

    "https://d3d0lqu00lnqvz.cloudfront.net/media/media/3b5bc0e7-c20e-439a-8722-6e4d6bfe8856.jpg" // resources/views/front/categories/view.blade.php
    https://d3d0lqu00lnqvz.cloudfront.net/media/media/3b5bc0e7-c20e-439a-8722-6e4d6bfe8856.jpg IMAX Systems Corporation