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The Congress of Vienna, which took place over several months during 1814 and 1815, was an attempt to resolve the numerous challenges presented by Napoleon’s expansion and his subsequent defeat. The talks have been seen as a critical moment in European history, and depending on the point-of-view, the results were either a diplomatic breakthrough or the last gasps of the continent’s conservative elites. It was also a crucial step toward German unification, although this was not clear at the time.

John Dee was one of the greatest scientific minds of his time, but also one of the most controversial. He was a learned man in fields as varied as mathematics and astronomy, centuries before they became formalized fields of study, but he is better remembered for performing magic and alchemy. Instead of astronomy, he became renowned across England for astrology, and he was one of the country’s most notorious occult writers during his life.

On November 29, 1943, as the Allies’ primary leaders met in Tehran, President Franklin Delano Roosevelt described to Soviet leader Joseph Stalin his idea for the organization that would become the United Nations. The American president suggested that the active arm of the organization be “the Four Policemen”: the U.S., USSR, UK, and China. Stalin agreed with much of the framework in principle, but asserted that China likely would not possess the strength after the war to assist.

In 1869, the Atlantic Monthly magazine published a new novella in serial form. This bizarre tale, The Brick Moon, was written by a historian (and Unitarian minister) named Edward Everett Hale, who had already written several well-received novels and articles. However, this was something completely different today, as it was in the genre of what is today considered science fiction. Many people compared the new work to the previous novels of French writer Jules Verne, including From the Earth to the Moon, but Hale’s work was presented as a genuine account of a previous experiment.

It has been famously pointed out that the Holy Roman Empire was neither holy, nor Roman, but it was also not an empire in the sense people expect when hearing the term, but it is clear that church clergy occupied a privileged place in medieval society. Europe had inherited Christianity from the Roman Empire, and the concept of a united Christendom and empire were practically synonymous. Indeed, there was no real consciousness of the Roman Empire ever having ended.

Among the world’s most recognizable man-made structures, the Dome of the Rock–known in Arabic as the Qubbat as-Sakara–is also one of its most mysterious. Although much of the Dome’s construction, reconstruction, and later additions are well-known from historical texts and archeological work, what it represents, why it was built where it was, and even its use remain the subject of scholarly controversy.

The American Revolution is replete with seminal moments that every American learns in school, from the “shot heard ‘round the world” to the Declaration of Independence, but the events that led up to the fighting at Lexington & Concord were borne out of 10 years of division between the British and their American colonies over everything from colonial representation in governments to taxation, the nature of searches, and the quartering of British regulars in private houses.

The enduring image of World War I is of men stuck in muddy trenches, and of vast armies deadlocked in a fight neither could win. It was a war of barbed wire, poison gas, and horrific losses as officers led their troops on mass charges across No Man’s Land and into a hail of bullets. While these impressions are all too true, they hide the fact that trench warfare was dynamic and constantly evolving throughout the war as all armies struggled to find a way to break through the opposing lines.

Though both Japan and China modernized at the start of the 20th century and China far outweighed Japan in terms of men and materiel potential, the Japanese handily won the first modern war between the two sides, decisively defeating the Chinese in the First Sino-Japanese War. The conflict resulted in Japan’s short-term gains in the wake of victory, and the long-term disaster for both sides’ new roles in Asia, for with the end of Chinese dominance in East Asia came a new era for the region as a whole, an era whose consequences and horrors would not be fully realized for several more decades.

As a basic definition, it may be said that an Ice Age is simply a period of time during which thick ice sheets cover vast areas of land. These sheets have advanced and retreated, at times taking over the entire planet, and conversely disappearing nearly altogether. Glacial ice formed by this regularly occurring process does not sit in a state of inertia, but moves dynamically, reshaping the geological features of the continents.

Though it was one of the most advanced civilizations of its time and responsible for the most ancient prehistoric urban sites across the Indian subcontinent, the Indus Valley Civilization was forgotten for millennia, until 20th century archaeologists rediscovered and began excavations at Mohenjo-daro and Harappa.

Mind-reading. Foretelling the future. The ability to move objects without touching them. Being able to see distant and hidden objects with the mind. To most people, this sounds like the high points of the act of an illusionist, a person who uses trickery to baffle and confuse an audience while performing stage magic to achieve uncanny feats. But we all know these things really are impossible. Aren’t they?

It takes a special type of person to serve in a nation’s navy, especially on long voyages that separate men and women from their loved ones, and no service is both loved and hated as that aboard submarines, for very few people ever serve on them on a whim. For one thing, the psychological impact of being trapped for long periods underwater in tight, cramped quarters is more than many people can stand.

The enduring image of World War I is of men stuck in muddy trenches, and of vast armies deadlocked in a fight neither could win. It was a war of barbed wire, poison gas, and horrific losses as officers led their troops on mass charges across No Man’s Land and into a hail of bullets. While these impressions are all too true, they hide the fact that trench warfare was dynamic and constantly evolving throughout the war as all armies struggled to find a way to break through the opposing lines.

Located in the Tarim Basin of Asia during the first few centuries CE, a people and a kingdom grew to prominence in medieval central and east Asian geopolitics. The people are known today as the Tocharians, and their primary kingdom was Kucha, but despite their longevity, this incredible kingdom and its people have been overlooked and misunderstood by modern societies and historians for centuries. The lack of in-depth studies on the Tocharians largely stems from the fact that they are relatively newcomers to the modern academic scene.

We take time for granted as it passes during every moment of our existence. Other things may change, but time remains constant and predictable. The past, the present, and the future exist within a harmonious, reliable, and never-changing system. Or at least that’s how it seems. It was Albert Einstein who, in 1905, first theorized that time might not be quite as straightforward as that. In one of the most influential papers on physics ever published[1], he proposed something called “time dilatation.”

From about 3400-2600 BCE, the Yamnaya culture stretched from southeastern Europe into central Asia, greatly affecting other contemporary cultures in Europe and the Near East. The hallmarks of Yamnaya culture adopted by other cultures in the Near East and Europe include the use of metal tools and weapons.

On the morning of January 28, 1986, the Space Shuttle Challenger launched for the 10th time, beginning mission STS-51-L. Space shuttles had already successfully completed 24 missions, and no American spacecraft had ever failed to reach orbit during an official mission.

The political and military nature of the Revolutionary War was just as full of intrigue. While disorganized militias fought the Battles of Lexington & Concord, George Washington would lead the Continental Army in the field while men like Thomas Jefferson drafted the Declaration of Independence in Philadelphia and Benjamin Franklin negotiated overseas in France.

During the reign of the Artaxiad dynasty, Armenia became a hub of trade and commerce, connecting the Silk Road and the Mediterranean world. The Armenian kings encouraged the development of agriculture, commerce, and arts, and the kingdom became renowned for its skilled artisans, writers, and philosophers. Of course, given its central location, the dynasty also faced numerous challenges, including repeated invasions by the Roman and Parthian empires, internal conflicts, and economic hardships.