World War I, also known in its time as the "Great War," or the "War to End all Wars," was an unprecedented holocaust in terms of its sheer scale. Fought by men who hailed from all corners of the globe, it saw millions of soldiers do battle in brutal assaults of attrition which dragged on for months, with little to no respite. Tens of millions of artillery shells and untold hundreds of millions of rifle and machine gun bullets were fired in a conflict that demonstrated man's capacity to kill each other on a heretofore unprecedented scale.

The acrid stench of asphalt and sulfur singes the hairs of people’s nostrils, and when the blustering winds subside, the potent miasma lingers in the air. To the untrained eye, the La Brea Tar Pits seem to be nothing more than simply pools of thick, viscous black sludge...The pit’s contents have spelled the doom for a countless number of creatures both large and small, from legions of insects to mighty mastodons, mammoths, and snarling saber-toothed cats from the Pleistocene Era. La Brea Tar Pits are considered by many scientists to be among the greatest finds in modern history.

Standing around 10 feet tall and weighing several tons, woolly mammoths seem like the stuff of legend, but ancient cave art indicated that unlike dinosaurs, woolly mammoths were contemporaries of early humans, with the last ones going extinct only about 4,000 years ago. All of that explains why people have long been fascinated by woolly mammoths and have even envisioned bringing them back to life via genetics sometime in the future.

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).

The early history of our planet 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. The current view of science is that planet Earth is around 4.6 billion years old. The first four billion years of its development are known as the Precambrian period.

At one point or another, just about everyone has heard of the dodo bird, which is almost universally described as a cuddly, whimsical creature renowned for its alleged stupidity. This prehistoric avian had been known for hundreds of years, before it was made popular around the world in Lewis Carroll’s 1865 classic Alice's Adventures in Wonderland.

In late September 1863, the Confederates began laying siege to the Union Army of the Cumberland around Chattanooga. It would be their last gasp for supremacy in the West. Following the devastating Union defeat at the Battle of Chickamauga on September 20, the army and its shaken commander, General William S. Rosecrans, began digging in around the city and waiting for reinforcements to arrive.

The early history of our planet 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. The current view of science is that planet Earth is around 4.6 billion years old. The first four billion years of its development are known as the Precambrian period. For the first billion years or so, there was no life in Earth. Then the first single-celled life-forms, early bacteria and algae, began to emerge.

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. 

Little may have been known about Musashi at the time, but centuries later, he is the most infamous and renowned warrior in Japanese history. As a veteran of the Battle of Sekigahara (1600), Naiwa (1615), and the Shimabara Rebellion in Hizen (1637-1638), Musashi was a seasoned battlefield soldier, who went undefeated in over 60 duels, and authored an essential book on strategy Go Rin No Sho (The Book of Five Rings).  

In today’s world, getting fit and staying fit are two of the greatest obstacles people face in staying both physically and mentally healthy. As statistics indicate, more and more people are losing their battle, which can be both emotionally discouraging and harmful to their health in the long run. And as anyone can attest, success requires equal parts desire and discipline. Charles River Editors’ Get Fit Now series provides readers with the information, advice, and plans necessary to win the battle to get fit and stay fit.  

Tracing the migrations of the Denisovans and their interbreeding with Neanderthals and early human populations in Asia, Europe, Australia, and the Americas, Andrew Collins and Greg Little explore how the new mental capabilities of the Denisovan-Neanderthal and Denisovan-human hybrids greatly accelerated the flowering of human civilization over 40,000 years ago. They show how the Denisovans displayed sophisticated advances, including precision-machined stone tools and jewelry, tailored clothing, celestially-aligned architecture, and horse domestication.

Africa is the continent where the first humans were born. They explored the vast land and produced the first tools. And although we migrated from that continent, we never completely abandoned it. From the beginning of time, humans lived and worked in Africa, leaving evidence of their existence in the sands of the Sahara Desert and the valleys of the great rivers, such as the Nile and the Niger. Some of the earliest great civilizations were born there, and they give us an insight into the smaller kingdoms of ancient Africa.

If the world had a navel, it would be the Dead Sea, the lowest point on Earth where one can still stand on dry land. The photographs of this unique lake seem to be taken from a science fiction movie, or a land devastated after a nuclear holocaust. To others, the fluffy shores could remind them of Antarctica although it is in one of the warmest spots on the planet. Its white, creamy masses, scattered along golden beaches, are not ice floes or frozen water, but effervescent salt formations.

According to the Australian government’s website, at the time of first contact with Europeans, there were some 500 distinct Indigenous nations, speaking different languages and following their own religious and cultural practices. As with all human societies, that of the Indigenous Australians is abounding in stories. Stories of how the world came to be the way it is, stories of heroism and perfidy, stories about animals and birds, and stories about love and hate all have parts to play in the wide array of myths, legends, and tales created by Indigenous Australians.