Maclean's is Canada's leading weekly news magazine.

It was founded in 1905 by Toronto journalist/entrepreneur Lt.-Col. John Bayne Maclean. The 43-year-old trade magazine publisher purchased an advertising agency's in-house business journal — along with its 5,000-strong subscription base. The Business Magazine, launched in October of that year, was a pocket-sized digest of articles gathered from Canadian, US and British periodicals. It sold 6,000 copies. Inside its bright blue cover, the fledgling monthly anointed itself, "the Cream of the World's magazines reproduced for Busy People." Its aim, Maclean wrote a year later, was not "merely to entertain but also to inspire its readers." It was later renamed Maclean's in 1911.

The magazine switched from being a monthly general interest publication including fiction and gossip, to a bi-weekly news magazine in 1975, and to a weekly newsmagazine three years later.

Today Maclean's remains one of Canada's leading source of news and information. Maclean's is also famous for its annual ranking of Canadian universities. In 2001, Anthony Wilson-Smith became the magazine's editor, but he left the post at the end of February 2005 and was replaced by Kenneth Whyte. The magazine has been owned by the Rogers Communications conglomerate since Rogers acquired Maclean-Hunter, the former publisher, in 1994.

Noted Maclean's contributors have included Barbara Amiel, Peter Gzowski, Peter Mansbridge, Allan Fotheringham, Diane Francis, Paul Wells and Peter C. Newman.

Maclean's has been criticized for having a supposedly pro-Liberal (both the party and political stance) position by conservatives such as Conrad Black.

Petroleum (from Latin petra – rock and oleum – oil), crude oil, sometimes colloquially called black gold, is a thick, dark brown or greenish flammable liquid, which exists in the upper strata of some areas of the Earth's crust. Other name is naphta, from Persian naft or nafátá (to flow). It consists of a complex mixture of various hydrocarbons, largely of the alkane series, but may vary much in appearance, composition, and purity. It is an important "primary energy" source (IEA Key World Energy Statistics). Petroleum is also the raw material for many chemical products, including solvents, fertilizers, pesticides, and plastics.

In 1948, Einstein served on the original committee which resulted in the founding of Brandeis University. In 1952, the Israeli government proposed to Einstein that he take the post of second president. He declined the offer. On March 30, 1953, Einstein released a revised unified field theory.

He died in Princeton in 1955, leaving the Generalized Theory of Gravitation unsolved. He was cremated the same day at Trenton, New Jersey on April 18 1955. His ashes were scattered at an undisclosed location.

His brain was preserved in a jar by Dr. Thomas Stoltz Harvey, the pathologist who performed the autopsy on Einstein. Harvey found nothing unusual with his brain, but in 1999 further analysis by a team at McMaster University revealed that his parietal operculum region was missing, and to compensate his inferior parietal lobe was 15% wider than normal. The inferior parietal region is responsible for mathematical thought, visuospatial cognition and imagery of movement.

Albert Einstein (March 14, 1879–April 18, 1955) was a theoretical physicist who is widely regarded as the greatest scientist of the 20th century. He proposed the theory of relativity and also made major contributions to the development of quantum mechanics, statistical mechanics and cosmology. He was awarded the 1921 Nobel Prize for Physics for his explanation of the photoelectric effect and "for his services to Theoretical Physics".

After his general theory of relativity was formulated, Einstein became world-famous, an unusual achievement for a scientist. In his later years, his fame exceeded that of any other scientist in history, and in popular culture, Einstein has become synonymous with someone of very high intelligence or the ultimate genius. His face is also one of the most recognizable the world-over. In 1999, Einstein was named "Person of the Century" by Time Magazine. This popularity has also lead to a widespread use of Einstein in advertisement and merchandising, eventually including the registration of Albert Einstein as a trademark.

In his honor, a unit used in photochemistry, the einstein, as well as the chemical element einsteinium and the asteroid 2001 Einstein were named after him