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Mary Celeste was a brigantine built in 1861 at Spencer's Island, Nova Scotia, and originally named Amazon. She was wrecked off Cape Breton in 1867, salvaged, sold and in 1868 registered at New York and renamed Mary Celeste. In 1872 she was found adrift off the Azores, with no sign of her crew.

Metamorphic rock is one of the 3 major classes of rock comprising the Earth's crust, the others being SEDIMENTARY and IGNEOUS ROCKS. Metamorphic rock has been transformed, while in the solid state, by pressure, temperature and deformation.

Canada’s lumber and wood industries convert logs into various products, from lumber to wood chips.

General practice is the branch of medicine concerned with providing care (known as "primary and continuing care") to patients irrespective of their age, sex or type of problem.

Although medicines have been misused for as long as they have been available, a universally accepted definition of the term "drug abuse" does not exist.

The years since 1939 have seen great changes in Canadian medicine.

Like most industrial activities, mining involves risk. However, contemporary mining in Canada is much safer than it once was.

Mechanical Engineering is a branch of ENGINEERING that deals with the design, construction and operation of machines.

In 1963 the first detection of a molecule (the hydroxyl radical OH) at centimetre-wavelength radio frequencies was made by Weinreb, Barrett, Meeks and Henry of the Massachusetts Institute of Technology.

Mathematics is the science of numbers and spatial relationships.

In 1970, the Canadian government introduced guidelines for the development of a pipeline corridor south from the Mackenzie River delta to Alberta and the United States. Energy companies have since proposed three separate projects to transport natural gas by pipeline along this route — the Arctic Gas Pipeline, the Foothills Pipeline and the Mackenzie Gas Project — with an oil pipeline likely to follow in the first two cases. However, due to high costs, engineering challenges, environmental concerns, Indigenous land claims and changing markets, none of these pipelines has been built.

Eighty km northwest of Enterprise, a ferry connects with the highway to Yellowknife, and connecting roads to the east serve Fort Resolution and Fort Smith. The section from Enterprise to Hay River is now a separate highway. First built as an all-weather road, some of its length has been paved.

Muscular Dystrophy Canada (MDC) was founded in 1954 by a group of parents who had children with Duchenne muscular dystrophy. Now a national voluntary health organization with offices across Canada, MDC is dedicated to fighting over 40 different neuromuscular disorders.

Mineral engineering is that branch of ENGINEERING concerned with the application of scientific and technical knowledge to the search for and production of valuable MINERALS from naturally occurring surface, underground or below-water deposits.

See ELECTRONICS INDUSTRY.

Although Canada's coastline is extensive and contains many diverse molluscan species, the resource is economically relatively small. In 1995 nearly 200 000 t valued at $114.5 million were taken.

Metallurgy is the art, science and technology of turning metals and alloys (i.e., materials consisting of two or more metals) into forms suitable for practical use.

Medicine bundles (also called “sacred bundles”), wrapped collections of spiritually significant items, were the focus of most Indigenous spiritual rituals in the Plains region (see Plains Indigenous Peoples in Canada). A bundle might be a few feathers wrapped in skin or a multitude of objects such as animal skins, roots, or stone pipes inside a rawhide bag.

In the early years of the mental-health movement, mental health was often defined as the absence of symptoms of mental illness. Since that time, attempts have been made to relate mental health to a concept of psychological well-being and to certain capacities of individuals, eg, the capacity to perceive reality "objectively," to be flexible in meeting new situations and to understand another's point of view. However, no clear line divides the mentally healthy from the mentally unhealthy, and in addition, the definition of mental health is relative and is dependent on cultural context. The characteristics of a mentally healthy person in one milieu may seem very different from those of a mentally healthy person in another.

Mukluks are soft hide boots designed by Inuit peoples for manoeuvrability and warmth in northern environments.