In casual conversation, people often use the word theory to mean "hunch" or "guess": If you forget to put the bread in the breadbox and discover chunks have been taken out of it the next morning, you ...

Classical and scientific management theories emphasize efficiency and task specialization through systematic study of workers and processes by Frederick Taylor.

Scientists complete Schrödinger’s color theory after 100 years, resolving the mathematics behind how humans perceive hue.