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Spectroscopy is the field of study that examines, measures and interprets the electromagnetic spectra produced when radiant energy is emitted or absorbed by a substance. Spectroscopic methods are important in performing chemical analyses of substances and are used in astronomical studies.

The Internet is a global network of computers that communicate with each other. This exchange happens through a set of rules called protocols. Since Internet use became widespread in the 1990s, the system has affected most aspects of life. It has had both productive and destructive effects. The Internet has changed the way Canadians learn and work, buy products and services, communicate and consume entertainment. Most people think of the Internet as the World Wide Web. However, it takes a number of different forms, including networked physical objects called the Internet of Things.

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

Birth control means the deliberate prevention of conception and pregnancy. The birth control methods used in Canada range from the simplest (like abstinence) to the most complex (like male or female surgical sterilization). (See also History of Birth Control in Canada.)

The CIM-10B Bomarc was the world’s first long-range, nuclear capable, ground-to-air anti-aircraft missile. Two squadrons of the missile were purchased and deployed by the Canadian government in 1958. This was part of Canada’s role during the Cold War to defend North America against an attack from the Soviet Union. Prime Minister John Diefenbaker’s refusal to equip the missiles with nuclear warheads led to a souring of Canada’s relationship with the United States, especially once the Cuban Missile Crisis brought the issue to the fore. The issue split Diefenbaker’s Cabinet and contributed to his party losing the 1963 election.

The AES-90 word processor was an innovation released by the Montreal-based technology company Automatic Electronic Systems Inc. in 1972. The new machine was a pioneer within its generation that not only revolutionized office automation, but also set the trend for the design of word processors around the world.

In 1950, one of Canada’s greatest medical innovations was developed at the University of Toronto’s Banting Institute. Cardiac surgeon, Dr. Wilfred Bigelow and research fellow, Dr. John Carter Callaghan were trying to understand how hypothermia (see Cold-Weather Injuries) could slow the beating of an animal’s heart before surgery. They were also looking for a way to stimulate the heart when it faltered as it cooled. This largely unknown area of research could have tremendous applications for humans. The doctors partnered with Dr. John A. Hopps from the National Research Council of Canada, who created a portable artificial external pacemaker. It was designed to send electric pulses to the heart, which caused the heart to contract and pump blood to the body. The device was successfully tested on a dog in 1950. This landmark discovery paved the way for the use of implantable pacemakers in humans.

The Canadair CL-28 Argus was a long-range maritime patrol plane built in Canada. When it entered service with the Royal Canadian Air Force (RCAF) in 1957, it was the most advanced anti-submarine aircraft in the world. After unification of the Canadian Armed Forces in 1968, the CL-28 was re-designated as the CP-107. It was replaced in the early-1980s by the CP-140 Lockheed Aurora.

The Federation of Medical Women of Canada (FMWC) is a national organization that connects and supports Canadian women in the medical profession. Founded in 1924, the Federation has advocated on behalf of women physicians and women’s health. (See also History of Medicine to 1950; Women and Health.)

The Archaeological Survey of Canada (ASC) was established in 1971. It is the division of the Canadian Museum of History that deals with the archaeological heritage of Canada. The major goals of the ASC are to preserve archaeological sites, research into the history of Canadian Indigenous peoples and present the results of archaeological research to the public, through publications and exhibitions. The ASC’s Mercury Series of monographs is one of the main outlets for the reporting of archaeological research in the country. Its exhibitions, both in the Canadian Museum of History and smaller ones that travel across the country, enhance public understanding of the traditions of the Indigenous peoples of Canada. (See also Archaeology.)

The Nobel Prizes are awarded annually for achievements that have significantly benefitted humankind. The prizes are among the highest international honours and are awarded in six categories: physics, chemistry, physiology or medicine, literature, peace, and economics. They are administered by the Nobel Foundation and awarded by institutions in Sweden and Norway. Eighteen Canadians have won Nobel Prizes, excluding Canadian-born individuals who gave up their citizenship and members of organizations that have won the peace prize.

The “beartrap” was a Canadian innovation designed in the 1960s to enable the safe operation of helicopters from destroyer-size ships. Known formally as the Helicopter Hauldown and Rapid Securing Device (HHRSD), it is now an integral part of all Canadian frigates. The beartrap revolutionized maritime helicopter operations and was adopted by other navies.

Morse Code (Les Maîtres, 1967-70). Montreal instrumental and vocal rock group whose members included Raymond Roy (drums), Michel Vallée (bass guitar), and Jocelyn Julien (guitar). Christian Simard (keyboards, voice) was added in 1968.

Avian influenza, commonly known as “bird flu”, is a contagious viral disease that can affect several species of birds used in food production (e.g., chickens, turkeys), as well as pet birds, wild birds and some mammals (see Poultry Farming). The viruses responsible for the disease can be classified into two categories: high pathogenicity or low pathogenicity. The highly pathogenic H5N1 subtype of the avian influenza virus is transmissible to humans. In Canada, cases of avian influenza must be reported to the Canadian Food Inspection Agency.

The National Energy Program (NEP) was an energy policy of the government of Canada from 1980 through 1985. Its goal was to ensure that Canada could supply its own oil and gas needs by 1990. The NEP was initially popular with consumers and as a symbol of Canadian economic nationalism. However, private industry and some provincial governments opposed it.

A federal-provincial deal resolved controversial parts of the NEP in 1981. Starting the next year, however, the program was dismantled in phases. Global economic conditions had changed such that the NEP was no longer considered necessary or useful. The development of the oil sands and offshore drilling, as well as the rise in Western alienation and the development of the modern Conservative Party of Canada, are all aspects of the NEP’s complicated legacy.

Pablum is a multi-grain processed cereal developed as a nutritious, precooked digestible food for infants. The cereal was first developed at the Hospital for Sick Children in Toronto in 1930 by pediatric doctors Theodore Drake and Frederick Tisdall under the supervision of physician-in-chief Alan Brown. Pablum became commercially available in 1934 through an agreement with the Mead Johnson & Company and was used as a brand name through the early 21st century.

Established in 1994, the Canadian Medical Hall of Fame (CMHF) is a national charitable organization. The mission of the CMHF is to “recognize and celebrate Canadian health leaders whose work has advanced health and inspires the pursuit of careers in the health sciences.” As of 2006, up to six individuals are inducted into the CMHF annually. Laureates are featured at the CMHF’s Exhibit Hall in London, Ontario, and online through the CMHF’s official website.

Lizards are reptiles that belong to several suborders within the order Squamata (which also includes snakes). They are the most diverse group of living reptiles and are found on all continents except Antarctica. There are six species of lizard currently found in Canada. In addition, one species, the pygmy short-horned lizard, is extirpated. This means that, while it continues to live in other parts of its range, it is no longer found in Canada. Five of the six lizard species in Canada are native, while the sixth, the common wall lizard, is introduced from Europe.

Canada's agriculture and food industries have changed greatly in the years since the Second World War. Growth in Canada’s economy, and associated social changes, have altered the way food is produced, processed, handled, sold and consumed.

   Aviation, the art and science of flying, has been a practical reality since the early 20th century. Canadians have participated in its development almost from its inception.