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In the decades after the Apollo program, American space shuttles flew over 130 missions and successfully completed over 98 percent of them, but unfortunately, the two most famous missions were the ones that ended tragically aboard the Challenger and Columbia. The Space Shuttle Challenger Disaster: The History and Legacy of NASA’s Most Notorious Tragedy chronicles the disaster from the origins of the Challenger mission to what went so terribly wrong.

The reign of the Khmer Rouge, a Cambodian communist regime, began on April 7, 1975 as Khmer Rouge militants entered the Cambodian capital of Phnom Penh, ultimately gaining control and forcing out its residents. For the next four years, the regime would remain in power and commit what is now referred to as the Cambodian Genocide. Their reign would result in economic turmoil, cultural destruction, and mass death, impacting Cambodia to this day.

As technological advances and the creation of flying aircraft became realities, the sighting of UFOs increased, as did the interest in potential contact with aliens. It would hardly be groundbreaking for scientists in the 20th century to have a lunchtime discussion in which the search for extraterrestrial life arises, and the question of where it might reside is innocuous enough. However, a furor was created somewhat innocently when physicist Enrico Fermi voiced his “casual lunchtime remark” in the presence of colleagues in 1950.

Halfway into the 19th century, Spain's Catalonia underwent a sweeping transformation when it was thrust into not one, but two golden eras - the Renaixença and the Industrial Revolution. It was during this explosive period of creativity, thriving prosperity, and invigorated patriotism that a steadfastly nonconforming and fascinatingly eccentric icon was born, one that was about to take Catalonia by storm with his brilliant eye for unorthodox art and his legendary - or as some would say, notoriously - out-of-the-box ideas.

When people think of ancient Greece, images of philosophers such as Plato or Socrates often come to mind, as do great warriors like Pericles and Alexander the Great. But hundreds of years before Athens became a city, a Greek culture flourished and spread its tentacles throughout the Western Mediterranean region via trade and warfare. Scholars have termed this preclassical Greek culture the Mycenaean culture.

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.

Theologian and reformer John Wycliffe never had the opportunity to take his doctrines outside of his native England, but he could never have imagined that his teachings would one day travel as far as 920 miles east to Bohemia. In fact, while his contentious convictions aroused much ado at home, receiving both praise and contempt from followers and ecclesiastical figures, his messages would be far more resonant across the Channel than they ever were back home.

Discover the the life and accomplishments of Max Planck, theoretical physicist whose revolutionary discovery of energy quanta and formulation of fundamental quantum theory allowed for countless others to expand on the knowledge of atomic processes.

Sulla had become renowned in Rome as a general during the Jugurthine, Social, and Mithridatic Wars, but naturally he is now remembered for the gruesome acts committed during his tenure as Rome’s first lifelong dictator. Sulla’s unprecedented period of one-man rule is viewed by many historians as a means of re-establishing peace and order in Roman politics while safeguarding the Republican system from abuse by powerful individuals.

Gnosticism is one of the great mysteries in the history of Western religion. At its core is an ancient Greek word, gnosis, a word prominent in the writings of Plato which refers to a deep personal knowledge or understanding that often transcends the physical world. The Gnostics painted a picture of a fallen, broken world in which physicality was a product of a lesser deity. This deity was created in defiance of the One and in order to trap humans and blind them to the truths of their predicament and divine origins.

Germany's Nazi Party was remarkably implacable in the hostility it showed to the outside world, staunchly opposing both Communism and liberal democracy from the moment of its inception to that of its violent dissolution.

After a brief revival following World War I, during which it successfully defeated a Soviet attempt to invade in an effort to carry "international revolution" into Germany and Central Europe, Poland once again fell victim to its neighbors in 1939. Adolf Hitler's Third Reich and Josef Stalin's USSR collaborated in the conquest and then split Poland between them. The Germans instituted oppressive rule in their portion of Poland, executing some 7,000 people on political grounds and imprisoning thousands of others.

Hinduism is one of the world’s great religions, dominating the Indian subcontinent for most of the last millennium, and its largest temple is an unbelievably magnificent structure located in Angkor, Cambodia. Known in English as Angkor Wat ("City Temple"), the gigantic complex continues to fascinate the world, both due to its sheer grandeur and size, as well as its ornamental decorations both inside and out.

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. For example, the current eon is called the Phanerozoic Eon, which means “visible life”. This is the eon in which multicellular life has evolved and thrived. Before this, life was microscopic (single cells).

Most scientists believe the evolution of humans has a history as long as life itself. Anatomically modern humans and all other life that has existed on the planet first came about from the single-celled microorganisms that emerged approximately 4 billion years ago. Through the processes of mutation and natural selection, all forms of life developed, and this continuous lineage of life makes it difficult to say precisely when one species completely separates from another.

On August 1, 1945, a month before the formal end of World War II, the British War Office announced the disbanding of a small, eclectic unit, the Long Range Desert Group. Since its founding five years earlier, in June 1940, the LRDG had pioneered and refined the concept and tactics of deep penetration, covert reconnaissance in the North African desert, and later as a more varied special forces operations unit in the Aegean, Italy, and the Balkans.

The Civil War was the deadliest conflict in American history, and had the two sides realized it would last four years and inflict over a million casualties, it might not have been fought. Since it was, however, historians and history buffs alike have been studying and analyzing the biggest battles ever since. Americans have long been fascinated by the Civil War, marveling at the size of the battles, the leadership of the generals, and the courage of the soldiers.

Lord Byron’s very name conjures up visions of the Romantic movement and outlandishly dressed bohemians, for if Alfred, Lord Tennyson was the poetic darling of the masses, Byron was the hero of the hedonists. While the traditional English literary hero was a nobleman rescuing a damsel in distress, Byron created the antihero, a man plagued by self-doubt and hidden sorrow. At the same time, his hero was also capable of facing reality once he had wrestled through his own angst, and even of occasionally acting nobly in the great tradition of the author’s Puritan forebears.

French Indochina: The History and Legacy of the French Empire’s Colonialism in Southeast Asia analyzes the colonization of Southeast Asia and what happened as a result of the decolonization. You will learn about the French in Southeast Asia like never before.

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.