Anarchism is a political philosophy encompassing theories and attitudes which consider the state, as compulsory government, to be unnecessary, harmful, and/or undesirable.

Autism is a brain development disorder characterized by impaired social interaction and communication, and by restricted and repetitive behavior.

The albedo of an object is the extent to which it diffusely reflects light from the Sun.

The letter A is the first letter in the Latin alphabet.

Alabama is a state located in the southern region of the United States of America.

In Greek mythology, Achilles was a Greek hero of the Trojan War, the central character and the greatest warrior of Homer's Iliad.

Abraham Lincoln was the 16th President of the United States.

Aristotle was a Greek philosopher, a student of Plato and teacher of Alexander the Great.

The Academy Awards, popularly known as the Oscars, are presented annually by the American Academy of Motion Picture Arts and Sciences to recognize excellence of professionals in the film industry, including directors, actors, and writers.

Altruism is the deliberate pursuit of the interests or welfare of others or the public interest.

Ayn Rand, was a Russian-American novelist, philosopher, playwright, and screenwriter.

Allan Dwan was a pioneering Canadian-born American motion picture director, producer and screenwriter.

Algeria, officially the People's Democratic Republic of Algeria, is a country located in North Africa.

Anthropology is the study of human beings, everywhere and throughout time.

Agricultural science is a broad multidisciplinary field that encompasses the parts of exact, natural, economic and social sciences that are used in the practice and understanding of agriculture.

Alchemy is both a philosophy and a practice with an aim of achieving ultimate wisdom as well as immortality, involving the improvement of the alchemist as well as the making of several substances described as possessing unusual properties.

Austria, officially the Republic of Austria, is a landlocked country in Central Europe.

An astronomer is a scientist who studies celestial bodies such as planets, stars, and galaxies.

American Standard Code for Information Interchange, is a coding standard that can be used for interchanging information, if the information is expressed mainly by the written form of English words.

The bouncing ball animation consists of these 6 frames.

In Greek and Roman mythology, Apollo, is one of the most important and many-sided of the Olympian deities.

Andre Kirk Agassi is a former World No. 1 professional American tennis player who won eight Grand Slam singles tournaments and an Olympic gold medal in singles.

The Austro-Asiatic languages are a large language family of Southeast Asia, and also scattered throughout India and Bangladesh.

The Afro-Asiatic languages constitute a language family with about 375 living languages and more than 350 million speakers spread throughout North Africa, the Horn of Africa, and Southwest Asia, as well as parts of the Sahel, West Africa and East Africa.

Andorra, officially the Principality of Andorra, also called the Principality of the Valleys of Andorra, is a small landlocked country in western Europe, located in the eastern Pyrenees mountains and bordered by Spain and France.

In mathematics and statistics, the arithmetic mean of a list of numbers is the sum of all of the list divided by the number of items in the list.

The American Football Conference is one of the two conferences of the National Football League. The other is the National Football Conference. This conference, along with the Nfc, contains 16 teams.

Animal Farm is a dystopian novel by George Orwell.

Amphibians, such as frogs, toads, salamanders, newts, and caecilians, are ectothermic or cold-blooded animals that metamorphose from a juvenile, water-breathing form to an adult, air-breathing form.

Alaska is the largest state of the United States of America by area; it is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait.

Agriculture refers to the production of food and goods through farming and forestry.

Aldous Leonard Huxley was an English writer and one of the most prominent members of the famous Huxley family.

Algae are a large and diverse group of simple, typically autotrophic organisms, ranging from unicellular to multicellular forms.

In law, an appeal is a process for requesting a formal change to an official decision.

Court of Appeal, Court of Appeals, and Appellate Division redirect here; for a list of specific courts using those titles, see Court of Appeal, Court of Appeals, and Appellate Division.

"America the Beautiful" is an American patriotic song.

Assistive technology is a generic term that includes assistive, adaptive, and rehabilitative devices for people with disabilities and includes the process used in selecting, locating, and using them.

Asphalt is a sticky, black and highly viscous liquid or semi-solid that is present in most crude petroleums and in some natural deposits sometimes termed asphaltum.

The American National Standards Institute or ANSI is a private non-profit organization that oversees the development of voluntary consensus standards for products, services, processes, systems, and personnel in the United States.

The Apollo 11 mission was the first manned mission to land on the Moon.

Apollo 8 was the first manned space voyage to achieve a velocity sufficient to allow escape from the gravitational field of planet Earth; the first to escape from the gravitational field of another celestial body; and the first manned voyage to return to planet Earth from another celestial body.

An astronaut or cosmonaut is a person trained by a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft.

The alkali metals are a series of chemical elements comprising Group 1 of the periodic table: lithium, sodium, potassium, rubidium, caesium, and francium.. The alkali metals provide one of the best examples of group trends in properties in the periodic table, with well characterized homologous behavior down the group.

An alphabet is a standardized set of letters basic written symbols each of which roughly represents a phoneme in a spoken language, either as it exists now or as it was in the past.

In chemistry and physics, the atomic number is the number of protons found in the nucleus of an atom and therefore identical to the charge number of the nucleus.

Anatomy is a branch of biology and Medicine which studies primarily the internal structure and design of the structure of living things.

Andrei Arsenyevich Tarkovsky was a Soviet Russian filmmaker, writer and opera director.

Ambiguity is the property of being ambiguous, where a word, term, notation, sign, symbol, phrase, sentence, or any other form used for communication, is called ambiguous if it can be interpreted in more than one way.

The Aardvark is a medium-sized, burrowing, nocturnal mammal native to Africa.

Adobe is a natural building material made from sand, clay, and water, with some kind of fibrous or organic material, which is shaped into bricks using frames and dried in the sun.