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Britannica Guide to Theories and Ideas That Changed the Modern World
There was a time when people assumed that the world was flat. Once an alternate theory was proposed, however, that conceit was challenged and, eventually, disproved. In short, …
Plate Tectonics, Volcanoes, and Earthquakes
The devastation wrought by earthquakes and volcanoes often obscures the fact that these destructive forces are also some of the most creative on the planet birthing mountains and …
Rivers and Streams
Winding their way through the planet's landscapes and supplying some of its most prosperous cities with fresh water, food, and transportation conduits, rivers and streams have …
World War I
Beginning with the assassination of the Archduke Ferdinand of Austria, World War I, sometimes called the Great War, spiraled into a struggle lasting four years, leaving ten million …
American Civil War and Reconstruction
The American Civil War hit close to home as it pitted brother against brother, Americans fighting one another to defend their differing beliefs. Years of war were followed by a …
Inner Solar System
The planets closest to the Sun-Mercury, Venus, Earth, and Mars-include the world we know and its closest neighbors. However, despite our proximity, these rocky, silicate-based …
Britannica Guide to the Atom
Common to all matter and its smallest and most fundamental unit, the atom determines the properties of a substance and how it responds to other materials and stimuli. Dividing the …
Britannica Guide to Sound and Light
Audio and visual cues facilitate some of our most powerful sensory experiences and embed themselves deeply into our memories and subconscious. Sound and light waves interact with …
Advances in Democracy
Beginning with the Industrial Revolution, Europe was seized by the spirit of political and social innovation and reform that has continued into the 21st century. The general …
History of India
Because of its natural wealth, India has long been a tempting prize for invaders, yet foreign forces such as the Mughal Empire and the British did not destroy India's vibrant …