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Create AccountAn epidemic occurs when an infectious disease spreads rapidly throughout a community at a particular time. Several epidemics have occurred over the course of Canadian history, the most disastrous being those which affected Indigenous peoples following the arrival of Europeans.
Click here for definitions of key terms used in this article.
The dark grey lunar surface reflects only 7% of the sunlight it receives (comparable to the reflectivity of black soil). The moon is dominated by thousands of craters, ranging from microscopic pits to gigantic Clavius, diameter 230 km.
Office Automation is a general term that includes a wide range of applications of computer, communication and information technologies in office environments. Though automation is in a continual state of flux, the size of the market is huge, with annual investments measured in billions of dollars.
Ophthalmology is the medical specialty concerned with the eyes and their relationship to the body.
Nearly four months have passed since the discovery of a solitary case of mad cow disease threw Canada's beef business into turmoil, and what has changed?
"IT'S THE CRIME of the century," 82-year-old Len Greenall says, his voice rising in passionate indignation. "It's an immoral invasion of bodily privacy." He's sitting at the dining room table of his Surrey, B.C.
IT WAS NOT what health-care officials had hoped for, to say the least. Only a week earlier, one of Health Canada's leading authorities on infectious diseases had speculated that SARS - severe acute respiratory syndrome - might actually be "easy to control.
For centuries people have argued about the age of the Earth; only recently has it been possible to come close to achieving reliable estimates.
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.
Energy plays a unique and critical role in the world; no activity of any kind (no "work") can take place without the movement or conversion of energy.
Canadian agriculture has experienced a markedly distinct evolution in each region of the country. A varied climate and geography have been largely responsible, but, in addition, each region was settled at a different period in Canada's economic and political development.
Cancer is a term describing more than 100, possibly as many as 200, different diseases characterized by the common property of abnormal cell growth. Cancer is the second-leading cause of death in Canada and second only to accidents as a cause of death in children under 15 years of age.
A doctor's diagnosis can land like a punch in the solar plexus: you have Parkinson's disease. Chronic, progressive and incurable. In the life-altering reverberations that follow come the questions.
British ColumbiaIn BC, most work has been carried out by the Underwater Archaeological Society of British Columbia (UASBC), a large, successful and mostly avocational group that was formed in 1975. The UASBC's has published seven regional shipwreck inventories.
Current breast cancer incidence and mortality rates are available through the Canadian Cancer Society, which annually updates these and other statistics.
Biomass energy, or bioenergy, is the energy stored in biomass — that is, nonfossil organic materials such as wood, straw, vegetable oils and wastes from forestry, agriculture and industry, as well as municipal solid waste.
This article was originally published in Maclean's Magazine on March 20, 2000. Partner content is not updated.
One Saturday morning last November, Peggy Code collapsed outside a suburban Calgary mall. Helped to a nearby bench, the 64-year-old nurse realized she was drooling and that the entire left side of her body was insensate.
Telidon, a combination of the Greek words meaning "to know at a distance," was a waypoint en route to the Internet and was an early demonstration of how technology can provide on-demand access to information.
The theory and practice of medicine in Canada changed significantly from the 16th to the 20th century, with important developments in medical education and regulation, understanding of anatomy and disease, public health and immunization, and pharmacology.
BILL ENOUY IS PROUD of his town. Oh, the jolly looking mayor of KIRKLAND LAKE, Ont., knows the main street needs a facelift, and that something should be done about the shortage of family physicians.
