Search for "indigenous families system"

Displaying 1-4 of 4 results
Article

Canada and the Development of the Polio Vaccine

During the first half of the 20th century, poliomyelitis, a.k.a. polio or “The Crippler,” hit Canada harder than anywhere else. Successive polio epidemics peaked in a national crisis in 1953. By that time, however, scientists at Connaught Medical Research Laboratories of the University of Toronto had made key discoveries that enabled American medical researcher and virologist Jonas Salk to prepare the first polio vaccine. Connaught Labs also solved the problem of producing the vaccine on a large scale. Canada went on to play an important role in the development of the oral polio vaccine and international efforts to eradicate the disease.

Click here for definitions of key terms used in this article.

Article

Food Additives

Consumers normally consider that the term "food additive" refers to almost all substances, primarily chemical in nature, added to foods during production, manufacture, packaging or storage.

Article

Uranium

Uranium oxide was first identified in 1789 by M.H. Klaproth in the MINERAL pitchblende, but its distinctive property of radioactivity was discovered much later (1896) by Henri Becquerel.

Article

Lighting

From earliest times it has been recognized that artificial light prolongs daytime activities. Relaxation and social interaction necessarily occurred after the day's work was done; therefore, indoor lighting has always had a special association with this aspect of living.