Alan Turing had a radical and ingenious mind. He is considered one of the fathers of artificial intelligence, and his theories on this matter range from purely mechanical to almost spiritual. During World War II, his decryption of the Nazis’ Enigma codes proved vital for the Allied victory over the Axis powers. Turing’s fingerprints are everywhere, and yet his own country for quite some time failed to acknowledge it.

The creation of the Union of Soviet Socialist Republics (USSR) in 1922 was one of the defining events of the 20th century. This new federation, created to embody the ideals of communism and the notion of rule by the people, was intended to be different from any other nation in the world. This utopian vision inspired people around the world, and soon, communism became an international movement. However, the history of the Soviet Union did not develop in the way its originators envisaged.

Until 1939, World War I was known as “the war to end all wars”, but when Nazi Germany capped its mounting aggression against its neighbors by invading Poland, Europe was plunged into a second global conflict. It threatened the entire continent as well as the far-flung colonial possessions claimed by the French, the British, and the Dutch. German triumphs saw nation after nation fall, until only Great Britain remained defiant against Hitler’s dreams of conquest.

Constantine the Great was one of the most pivotal figures in the history of the Roman Empire and the widespread expansion of the Christian religion. This is in no way an understatement; Constantine was not only one of the last truly powerful Roman emperors, but he also successfully reconstituted the whole empire according to his vision of Rome’s future. He played the most significant role in transforming the Empire from a Greco-Roman pagan dominion into a bulwark of the Christian faith, granting for the first time real temporal power for the early Christian church.

Robert Oppenheimer had a lot resting on his shoulders. During the Second World War, he was tasked with directing the development of the world’s first nuclear arsenal. Known as the Manhattan Project, this super-secretive wartime project had the stoic visage of Oppenheimer overseeing the greatest experiment ever conducted by humankind. Much had happened in Oppenheimer’s life to lead him to this point, and much would subsequently take place after, but this moment was indeed the pinnacle of his career and his life.

During the bitter winter of 1692/93, a group of young Puritan women in the colonial town of Salem, Massachusetts, accused more than 200 of their neighbors and fellow townspeople of using witchcraft to injure and torment them. This was an incredibly serious allegation that led to sensational court proceedings and ended with the execution of 19 people.

The Europeans who came to the New World did not land upon a continent devoid of people. Yet to the Spanish, French, and English who traveled from their countries in search of gold and land, the native populations already living on the North American continent were an inferior race. Enslavement, eradication, and imprisonment were the just fates, they felt, for any who could keep them from attaining the wealth they sought.

The most notorious man in history, Adolf Hitler, is best known for having perpetrated crimes against humanity over the six-year course of World War II. His brutal extermination policies are responsible for the deaths of close to 30 million people he considered inferior, and added to that, the military casualties suffered by all parties, yields a grand total of approximately 60 million people dead by the end of the war. That number equates to 3% of the world's population at the time. But, who was this man? What made him into the monster he became? Can his childhood explain the formation of such a brutal dictator?

D-Day, June 6, is one of the most significant dates in the calendar. The 20th century's fate hung in the balance as Nazi Germany had marched across Europe, bringing the blitzkrieg, the Holocaust, and the mad dreams of Adolf Hitler across the bloodied landscape of Europe. In order for the Nazis to be stopped, the Allies had to invade occupied Europe. And invade they did, launching the most massive amphibious landing the world had ever seen.

Auschwitz is a monument to the barbaric inhumanity of the Nazi regime. It is the site where more than one million people were systematically tortured and killed in support of Adolf Hitler’s determination to eradicate entire populations that he viewed as racially impure.

The Great Depression was one of the most trying eras in American history. All aspects of the US were affected. After the stock market crash of 1929, the nation was thrust into a decade of turmoil and change - in government, the economy, and culture. Many of the changes brought about by the Great Depression remain today.

The Sumerians settled in the area known as Mesopotamia, between the Tigris and Euphrates Rivers, around 5,000 years ago. They produced many fundamental changes to the way in which human societies developed - these were the first city-builders, the first people to use wheeled vehicles, the first methodical astronomers, and the first people to develop a sophisticated written language. The Sumerians also produced art, music, and literature as well as created some of the first professional soldiers the world had ever seen.

While names like Nero, Caligula, Hadrian, and Constantine grab all the attention with their exploits, Marcus Aurelius tends to sit more in the historical background of the Roman Empire. In many ways, he is a lesser known emperor even though his written works have stood the test of time. Marcus, a prolific writer and formidable scholar, was perhaps the first to fulfill Plato’s dream of the philosopher king.

Here for the first time, in rich human, political, and scientific detail, is the complete story of how the bomb was developed, from the turn-of-the-century discovery of the vast energy locked inside the atom to the dropping of the first bombs on Japan. Few great discoveries have evolved so swiftly - or have been so misunderstood. From the theoretical discussions of nuclear energy to the bright glare of Trinity, there was a span of hardly more than 25 years.

Since its publication in 1960, William L. Shirer’s monumental study of Hitler’s German empire has been widely acclaimed as the definitive record of the 20th century’s blackest hours. The Rise and Fall of the Third Reich offers an unparalleled and thrillingly told examination of how Adolf Hitler nearly succeeded in conquering the world. With millions of copies in print around the globe, it has attained the status of a vital and enduring classic.