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An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.

11 Egyptian Gods and Goddesses

New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.

Why Is It Called Black Friday?

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Nelson Mandela, undated photo.

15 Nelson Mandela Quotes

Dancers at a Cinco de Mayo festival at the Mission District, San Francisco, California. (Photo dated 2019.) holidays

Is Cinco de Mayo Mexico's Independence Day?

Scolex (head) of the tapeworm Taenia solium. The hooks of the scolex enable the tapeworm to attach to the intestinal wall.

Uninvited Guests: The 7 Worst Parasitic Worms

Demystified - Do Lemmings Really Commit Mass Suicide? illustration

Do Lemmings Really Commit Mass Suicide?

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Last Updated: Jun 03, 2025

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Herbert A. Simon

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contemplation realistic thinking image critical thinking association fancy reification imagination convergent thinking divergent thinking drug use reproductive behaviour locomotion collective behavior humor communication aggressive behaviour feeding behaviour avoidance behaviour persuasion

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Key People

Leon Festinger

American psychologist

Jacob Moleschott

Dutch-Italian physiologist and philosopher

Oswald Külpe

German psychologist and philosopher

Karl Bühler

German psychiatrist