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An often overlooked, yet very important, environmental process in world history is known as the “Late Antique Little Ice Age,” which took place during the 6th century A.D. across most of the Northern Hemisphere and received its name because it was shorter and less well-known than the Little Ice Age, which took place from the 16th-19th centuries.

Freedom of the press isn’t just a fundamental right in America but a key part of the democratic process. When the United States secured its independence against Britain in the War of Independence in 1783, there was no certainty about what the new country would look like in terms of national governance. In 1787, delegates from the various states convened in Philadelphia to draft a constitution that would define this.

During the first half of the 1st millennium CE, an empire arose in Persia that extended its power and influence to Mesopotamia in the east, Arabia in the south, the Caucasus Mountains in the north, and as far east as India. This empire, known alternatively as the Sasanian Empire or Sassanid Empire, was the last of three great dynasties in Persia—the Achaemenid and the Parthian being the first two dynasties—before the rise of Islam.

Although all the titles of the Nag Hammadi library are not known, many people have heard about its most famous components: The Gospel of Thomas - at one time it was discussed whether it should be included in the New Testament - and The Gospel of Philip, which tried to revive the debate around the identity of Mary Magdalene: "Why do you love her more than all of us?" asks a disconcerted Peter to Jesus. Finally, the Nag Hammadi texts have led many scholars to reconsider the rigid canons imposed by the early Church, and the readers to find a more intimate religion that turned upside down many postulates of Christian orthodoxy.

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 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.

During the Late Bronze Age, from about 1500-1200 BCE, the Near East was a time and place where great kingdoms and empires vied for land and influence, playing high stakes diplomatic games, trading, and occasionally going to war with each other in the process. The Egyptians, Hittites, Babylonians, Assyrians, and several smaller Canaanite kingdoms were all part of this system, which was one of the first true “global” systems in world history and also one of the most materially prosperous eras in antiquity.

Since the Battle of the Little Bighorn, George Armstrong Custer has possessed one of the most unique places in American history. Although he was a capable cavalry officer who served honorably during the Civil War, he remains one of the most instantly identifiable and famous military men in American history due to the fact he was killed during one of the country's most well-known and ignominious defeats: the Battle of Little Bighorn.

Operation Condor: The History of the Notorious Intelligence Operations Supported by the United States to Combat Communists Across South America looks at the various intelligence operations and the winding chain of events that brought about conflicts in the region.

Since the early days of human warfare, which may date back to the Stone Age, combatants have sought to gain an advantage through the acquisition of secret information. With the growth of technology, a parallel advantage was sought through the application of numerous types of torture. In the 19th century, the concept of manipulation was added to military tactics, an attempt to influence the minds of assassins, double agents, and world leaders alike to act against their natures.

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.

Most adults alive today either remember or have heard of the turbulent 1960s, but far fewer are familiar with the similarities those more recent protests had with the earlier unrest of a century earlier. Although the Civil War is remembered as the seminal event of American history, and it is often portrayed as the Lincoln administration and the North fighting bravely to preserve the Union and ultimately end slavery, the truth at the time was far more complicated.

After the siege of Boston forced the British to evacuate that city in March 1776, Continental Army commander George Washington suspected that the British would move by sea to New York City, the next logical target in an attempt to end a colonial insurrection. He thus rushed his army south to defend the city. Washington guessed correctly, but it would be to no avail.

It's no surprise that the Shawnee continue to be closely associated with their most famous leader, Tecumseh, the most famous Native American of the early 19th century. While leading the Shawnee, he attempted to peacefully establish a Native American nation east of the Mississippi River in the wake of the American Revolution. Together with his brother Tenskwatawa, Tecumseh was in the process of forming a wide-ranging, Native American confederacy that they hoped would stem the westward flow of Anglo-American settlers.

Overall, Tulsa in 1921 was considered a modern, vibrant city. What had fueled this remarkable growth was oil, specifically the discovery of the Glenn Pool oil field in 1905. Within five years, Tulsa had grown from a rural crossroads town in the former Indian Territory into a boom town with more than 10,000 citizens, and as word spread of the fortunes that could be made in Tulsa, people of all races poured into the city.

The Pleistocene spans a period from around 2.5 million years ago (mya) 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. The Pleistocene Era: The History of the Ice Age and the Dawn of Modern Humans looks at the development of the era, what life on Earth was like, and the origins of archaic humans.

The narrative of American history is incomplete without the inclusion of the Native Americans that lived on the continent before European settlers arrived in the 16th and 17th centuries. Among these groups, one of the most famous is the Mohawk, who refer to themselves as Kanien'kehá:ka ("People of the Place of Flint"), but pop culture has a very different image in mind when it comes to the Mohawk. Those unfamiliar with the group associate them with the conspicuous Mohawk haircut, and images of a warlike people who scalp their enemies are still evoked.

Though they are not as well known as tribes like the Sioux or Cherokee, the Creek are one of the oldest and most important Native American tribes in North America. With roots that tie them to the Ancient Moundbuilders, the Creek were one of the most established groups in the Southeastern United States, and came to be known as one of the Five Civilized Tribes. It's also believed that the Creek were the first natives encountered by Spanish explorer Hernando De Soto's historic expedition in the mid-16th century.

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.

A lot of ink has been spilled covering the lives of history's most influential figures, but how much of the forest is lost for the trees? In Charles River Editors' American Legends series, listeners can get caught up to speed on the lives of America's most important men and women in the time it takes to finish a commute, while learning interesting facts long forgotten or never known.