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Ever since the human mind developed the capacity for thought, people have pondered not just the meaning of life, but the genesis of the world, the universe, and all the natural marvels and precious forms of life within it. To this day, all of these intricate subjects continue to be matters of great contention, and they are often best encapsulated in the debate between creationism and evolution. On the one hand are those who are adamant that it was God, or some other supreme being, that designed and crafted every detail of the universe.

In 2001, the critically acclaimed film A Beautiful Mind introduced millions to John Nash, Jr., one of America's most important 20th century mathematicians, nearly 50 years after he had won a Nobel Prize. Naturally, most viewers of the movie will remember a prodigy suffering from paranoid schizophrenia while overlooking how the man's innovative studies and works had a major influence on everything from economics to biology, cryptography, artificial intelligence, and political philosophy.

Machu Picchu is one of South America's best tourist spots, and the ruins have even been voted one of the Seven New Wonders of the World. But even though Machu Picchu is now the best known of all Incan ruins, its function in Incan civilization is still not clear. Some have speculated that it was an outpost or a frontier citadel, while others believe it to be a sanctuary or a work center for women. Still others suggest that it was a ceremonial center or perhaps even the last refuge of the Incas after the Spanish conquest.

The modern history of Africa was, until very recently, written on behalf of the indigenous races by the white man, who had forcefully entered the continent during a particularly hubristic and dynamic phase of European history. In 1884, Prince Otto von Bismarck, the German chancellor, brought the plenipotentiaries of all major powers of Europe together, to deal with Africa's colonization in such a manner as to avoid provocation of war. This event - known as the Berlin Conference of 1884-1885 - galvanized a phenomenon that came to be known as the Scramble for Africa.

At the conclusion of World War I, a once promised unified Arab state, which was to include the modern Hejaz, Syria, Lebanon, Palestine/Israel, Jordan and Iraq, did not materialize. Instead, the territories were divided between the French and British, but the British did reward the Hashemites by putting local leaders on the thrones of Iraq and Jordan....

The early history of Earth covers such vast stretches of time that years, centuries, and even millennia become virtually meaningless. Instead, paleontologists and scientists who study geochronology divide time into periods and eras.

World War II was the culmination of a quarter century of tank development, and it would also be the first major test of tanks in mobile warfare. However, many of the tanks were constructed with the static warfare of the Western Front in mind and were thus slow and had short operational ranges. Others were too light to face opposing tanks or the new generation of anti-tank weapons that hadn’t existed in World War I. The unsuitability of these tank models for this new kind of warfare was quickly recognized, and the belligerent powers scrambled to create better designs.

People’s timeless captivation with those supposedly endowed with supernatural powers - these gifted individuals oftentimes regarded as gods walking among everyone else - is a fascinating phenomenon in itself. Soothsayers and clairvoyants were particularly revered in past centuries, even by royals, nobles, and other influential figures, who placed oracles, mediums, and mystics in their retinues and sought counsel from them on a regular basis.

For much of the 20th century, South American governments in large part lived under a system of military junta governments. The mixture of indigenous peoples, foreign settlers and European colonial superpowers produced cultural and social imbalances into which military forces intervened as a stabilizing influence. The proactive personalities of military heads and the rigid structures of such a hierarchy guaranteed the "strong man" commanding officer an abiding presence in the form of executive dictator.

While he was one of the most influential men in the ancient world, research on Cyrus the Great is simultaneously fascinating and frustrating. Of course, this reality has deepened the mystique that surrounds Cyrus even to this day, and it has elevated his status from conqueror and king to enlightened humanist monarch and ideal ruler. Whatever the underlying issues, the incredible achievements of Cyrus distinguish him as one of the greatest kings in history, and his life, conquests, reforms, and rule continue to be of great interest over 2,500 years later.

Most scientists believe that mankind was originally spawned in the salty waters of the seas, and that over millennia creatures managed to evolve into today's primates. If this is so, the oceans have made it abundantly clear that have no desire to take their offspring safely back; from the time of the earliest sailing ships, there have been countless accidents and tragedies where numerous lives were quickly lost.

In 1988, a recently organized militant group issued its charter, which called upon Muslims to "raise the banner of Allah over every inch of Palestine". The group, an offshoot of the Muslim Brotherhood, declared, "Allah is its goal, the Prophet is the model, the Qur'an its constitution, jihad its path, and death for the sake of Allah its most sublime belief."

Submarines exercised a decisive impact on the outcome of the Pacific Theater in World War II. The US submarine fleet, largely though not exclusively under the overall command of Vice Admiral Charles Lockwood, strangled the supply lines and shipping traffic of the Empire of Japan. Their commerce raiding crippled both Japan's ability to keep its frontline units supplied and to manufacture the weapons, vessels, and vehicles needed to successfully carry on the struggle.

The fighting in North Africa during World War II is commonly overlooked, aside from the famous battle at El Alamein that pitted the British under General Bernard Montgomery against the legendary "Desert Fox", Erwin Rommel. But while the Second Battle of El Alamein would be the pivotal action in North Africa, the conflict in North Africa began all the way back in the summer of 1940 when Italian dictator Benito Mussolini declared Italy's entrance into the war.

Uranium is best known for the destructive power of the atom bombs, which ushered in the nuclear era at the end of World War II, but given the effectiveness of nuclear power, plants like those at Three Mile Island in Pennsylvania were constructed to generate energy for Americans during the second half of the 20th century. While nuclear power plants were previously not an option and thus opened the door to new, more efficient, and more affordable forms of energy for domestic consumption, the use of nuclear energy understandably unnerved people.

Today, the name Clint Eastwood conjures up many different and unforgettable images. While many will always associate him as the quintessential Western hero in classics like The Good, the Bad, and the Ugly, new generations know him as a critically acclaimed director and even an outspoken conservative firebrand.

During one of the most turbulent periods in the history of Rome, men like Julius Caesar, Mark Antony, and Octavian participated in two civil wars that would spell the end of the Roman Republic, and determine who would become the Roman emperor. In the middle of it all was history's most famous woman, the Egyptian pharaoh Cleopatra (BC 69-30), who famously seduced both Caesar and Antony, and thereby positioned herself as one of the most influential people in a world of powerful men.

In the 18th century, Italy was still divided into smaller states, but differently than during medieval times when the political entities were independent and were flourishing economic and cultural centers almost unrivaled in Europe. The events of 1848-1849 began to pull the peninsula together, however. The Unification of Italy: The History of the Risorgimento and the Conflicts that Unified the Italian Nation chronicles the turbulent events and wars that unified Italy, and the struggle to maintain the new nation.

Modern Latvia: The History and Legacy of Latvia’s Struggle for Independence in the 20th Century examines the geopolitics of the region, Latvia’s place in it, and the most important events in Lithuania’s recent history.

Scientists have long attempted to understand Earth’s past, and in service to that effort, they have divided the world’s history into eons, eras, periods, epochs, and ages. The Triassic Period: The History and Legacy of the Geologic Era that Witnessed the Rise of Dinosaurs looks at the development of the era, the extinction events that preceded it, and how dinosaurs began to evolve in the Late Triassic. You will learn about the Triassic Period like never before.