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An alliance is a relationship among people, groups, or states that have joined together for mutual benefit or to achieve some common purpose, whether an explicit agreement has been worked out among them. Members of an alliance are called allies. Alliances form in many settings, including political a…

AM broadcasting is radio broadcasting using amplitude modulation (AM) transmissions. It was the first method developed for making audio radio transmissions, and is still used worldwide, primarily for medium wave (also known as "AM band") transmissions, but also on the longwave and shortwave radio ba…

Plutarch (/ˈpluːtɑːrk/; Ancient Greek: Πλούταρχος, Ploútarchos, Koine Greek: [ˈplúːtarkʰos]; before AD 50 – after 120) was a Greek and later Roman Middle Platonist philosopher, historian, biographer, essayist, and priest at the Temple of Apollo in Delphi. He is known primarily for his Parallel Lives…

Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete (haploid reproductive cells, such as a sperm or egg cell) with a single set of chromosomes combines with another gamete to produce a zygote that develops into an organism composed of cells with two set…

A quorum is the minimum number of members of a group necessary to constitute the group at a meeting. In a deliberative assembly (a body that uses parliamentary procedure, such as a legislature), a quorum is necessary to conduct the business of that group. In contrast, a plenum is a meeting of the fu…

Edward Bagdon (April 30, 1926 – October 25, 1990) was an American professional football offensive lineman in the National Football League (NFL) for the Chicago Cardinals and the Washington Redskins. He played college football at Michigan State University and was drafted in the seventh round of the 1…

In mathematics, the irrational numbers are all the real numbers that are not rational numbers. That is, irrational numbers cannot be expressed as the ratio of two integers. When the ratio of lengths of two line segments is an irrational number, the line segments are also described as being incommens…

Qinghai is an inland province in Northwestern China. It is the largest province of China (excluding autonomous regions) by area and has the third-smallest population, with its capital and largest city being Xining.…

The Mongol Empire was the largest contiguous empire in history. Originating in present-day Mongolia in East Asia, the medieval empire at its height stretched from the Sea of Japan to Eastern Europe, extending northward into Siberia and east and southward into the Indian subcontinent, mounting invasi…

In metaphilosophy and ethics, metaethics (meta-ethics) is the study of the nature, scope, ground, and meaning of moral judgment, ethical belief, or values. It is one of the three branches of ethics generally studied by philosophers, the others being normative ethics (questions of how one ought to be…