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The Pleistocene spans a period from around 2.5 million years ago to just over 12,000 years ago, and it was an epoch of enormous change on Earth, mainly characterized by climate changes involving fluctuations between periods of extreme heat and long periods of glaciation. This period is commonly known as the Ice Age, despite the fact there were actually a number of separate periods of cold.

Although it was an incredibly important period in world history, the era after Alexander the Great's death is sometimes as confusing as it is frustrating for historians because the allegiances of his generals changed constantly and historical sources are often biased in some regards and utterly lacking in others. Although none of these men were able to replicate Alexander the Great’s territorial success, a few carved out sizable empires and were able to establish long-lasting political dynasties.

The outcome of the English Civil War was no doubt unthinkable to many across Europe before it actually happened, and the Battle of Edgehill represented the first sign that things might not go according to the typical plan. That year, the unthinkable happened when the king and Parliament broke with each other, raising their standards of war. The divinely appointed order was broken, and the result was bloodshed, terror, and chaos. Most notably, Edgehill would make clear that things might not simply go the king’s way.

In the 21st century, most people associate the idea of the possession of a person or place by a malevolent supernatural entity with the medieval world, and particularly with the Catholic Church, but the truth is considerably stranger. Virtually every human culture that has ever existed has talked about both possession and exorcism, a rite or ritual used to free a person or place from possession.

The question of man’s place in the extended universe has been pondered by every known culture since the beginning of recorded history. Lacking the means to prove otherwise, discussions of an alternative to Earth’s solitary existence have remained conceptual. The ongoing debate is spurred by the appearance of unexplainable phenomena through the centuries in the atmosphere and the space beyond, so much so that contact with alien civilizations has been depicted in some of the most ancient examples of representational art.

While modern technology has helped astronomers view the furthest reaches of the Solar System, it has also allowed scientists to start discovering planets orbiting distant stars. To make it easier to assess the relative mass and size of the new planets being discovered, scientists give these measurements as multiples of those properties for either Jupiter or Earth

The borderlands of the paranormal include some bizarre stories. However, none are more strange or unsettling than the tale of what became known as the Philadelphia Experiment, an alleged effort during World War II to make a US Navy ship invisible by using electrical power.

When one thinks of the world’s first cities, Sumer, Memphis, and Babylon are some of the first to come to mind, or if the focus then shifts to India, then Harappa and Mohenjo-daro will likely come up. But archaeologists recently uncovered a site thousands of years older than any of those, marking one of the oldest settled sites in the world.

India has been the location of many different empires throughout its long history. The Indus Valley Civilization was home to one of the world’s first civilizations more than 5,000 years ago, which was followed by the Aryan-Vedic culture and then a host of other kingdoms that flourished across the subcontinent. India has also been the birthplace of many religions. The Vedic religion of the Aryans evolved into the Hindu religion, and Buddhism and Jainism were also born in India. By the Middle Ages, India was home to many different religions and ethnic groups.

For much of American history, women were second-class citizens in the sense they could not vote or run for office and had few property rights. However, women were often able to overcome social restrictions and forcefully affect the world around them, sometimes nationally. This took a real force of character, determination, and sometimes bravery. Women activists focused on issues such as temperance, women’s property rights, improvident or violent husbands, women’s suffrage, cruelty to animals, concern for child labor, and more. This is the story of five such women.

England has more often been faced with the claims of competing kings and queens than with a period of no monarch at all. The major exception to that rule came in the 11 years between 1649 and 1660, when England was a republic. Following the disastrous reign of Charles I and the civil wars that led to his execution, Parliament and the army ruled England. England’s republican experiment started out as a work of collaboration and compromise; lords, army officers, and members of Parliament (MPs) worked together to find a political settlement.

By the time Christopher Columbus started setting east from the New World, he had explored San Salvador in the Bahamas (which he thought was Japan), Cuba (which he thought was China), and Hispaniola, the source of gold. As the common story goes, Columbus, en route back to Spain from his first journey, called in at Lisbon as a courtesy to brief the Portuguese King John II of his discovery of the New World.

Africa may have given rise to the first human beings, and Egypt probably gave rise to the first great civilizations, which continue to fascinate modern societies across the globe nearly 5,000 years later. From the Library and Lighthouse of Alexandria to the Great Pyramid at Giza, the ancient Egyptians produced several wonders of the world, revolutionized architecture and construction, created some of the world’s first systems of mathematics and medicine, and established language and art that spread across the known world.

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.

As labor unions and movements began to form and coalesce in the 19th century, the tensions between workers and companies led to demonstrations, encounters, and even conflicts that descended into violence. Among those, few were as notorious as the fight that took place on April 20, 1914 at Ludlow in the Southern Colorado coalfields between the Colorado National Guard and striking miners at a United Mine Workers camp. In the previous several decades, there had been a number of violent incidents during strikes, but in 1914, the Ludlow tragedy deeply shocked the nation.

Over the course of his life, Ely Samuel Parker was a Seneca chief, a civil engineer, a close friend and adjutant to General Ulysses S. Grant, an advocate for the Indian peoples, and the first Native American Commissioner of the Department of Indian Affairs. His marriage to a much younger socialite scandalized Washington, and he made a fortune on Wall Street and lost it all. He ended his life in genteel poverty, working for nearly 20 years in an obscure position for the New York City Police Department.

As Union commander George McClellan moved the Army of the Potomac up the Peninsula in early 1862, the Union army still had a nearly 2-1 advantage in manpower, so Army of Northern Virginia commander Joseph E. Johnston continued to gradually pull his troops back to a line of defense nearer Richmond as McClellan advanced. In conjunction, the Union Navy began moving its operations further up the James River, until it could get within seven miles of the Confederate capital before being opposed by a Southern fort.

The Underground Railroad is one of the most taught topics to young schoolchildren, and every American is familiar with the idea of fugitive slaves escaping to Canada and the North with the help of determined abolitionists and even former escaped slaves like Harriet Tubman. The secrecy involved in the Underground Railroad made it one of the most mysterious aspects of the mid-19th century in America, to the extent that claims spread that 100,000 slaves had escaped via the Underground Railroad.

"We, conquered by William, have liberated the Conqueror’s land." So reads the memorial to the British war dead at Bayeaux, Normandy. Commemorating those who gave their lives to free France in 1944, it also serves to remind us of an earlier conflict. For the English, the Norman conquest remains deeply embedded in the national psyche. As the last contested military invasion to have succeeded in conquering this proud island nation, the date of 1066 is the one every citizen can remember.

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. The Civil War was the deadliest conflict in American history, and had the two sides realized it would take four years and inflict over a million casualties, it might not have been fought. Since it did, however, historians and history buffs alike have been studying and analyzing the military and political history of the conflict ever since.