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Deep in the Amazon, the rain forest once covered ancient secrets. Spread across hundreds of thousands of acres are massive, geometric earthworks. The carvings stretch out in circles and squares that can be as big as a city block, with trenches up to 12 yards wide and 13 feet deep. They appear to have been built up to 2,000 years ago.

“A lot of people have the idea that the Amazon forests are pristine forests, never touched by humans, and that’s obviously not the case.”

Dr. Watling and her team reconstructed a 6,000-year-old environmental history of two geoglyph sites in the Amazon rain forest. To do this, they searched for clues in soil samples in and around the sites. Microscopic plant fossils called phytoliths told them about ancient vegetation. Bits of charcoal revealed evidence of burnings. And a kind of carbon dating gave them a sense of how open the vegetation had been in the past.

While it was built at roughly the same time as the Sphinx and the Great Pyramid of Giza, we know far more about those Egyptian sites. Incomplete knowledge of Stonehenge has turned it into a riddle that is now part of its identity.

a new exhibition at the British Museum, “The World of Stonehenge,” which runs through July 17. The show strives to lessen the mystery around the monument by focusing on recent discoveries and putting them in the context of life in Britain, Ireland and northwestern Europe before, during and after Stonehenge’s construction.

He described the site as a mix between a town hall and a cathedral, where people mingled for both religious and social reasons.

In a new study published today in the journal Science, researchers say they have confirmed that eruptions large enough to bury the U.S. under 300 feet (91 meters) of lava occurred at the same time that vast numbers of plant and animal species disappeared from the fossil record. About 201 million years ago, tectonic forces started ripping the supercontinent known as Pangaea apart, said Terrence Blackburn, a geologist at the Carnegie Institution for Science in Washington, D.C., and lead author of the study. The underlying mantle rock melted, generating these large eruptions, he added. The rift, which eventually created the Atlantic Ocean basin, happened between sections of Pangaea that would go on to become North America and Africa. (Read about how Pangaea formed.)

by using a rare mineral called zircon, found in igneous rocks like basalts, the researchers were able to narrow down their margin of error to 20,000 to 30,000 years—pegging the initial eruptions to just before the mass extinction event. “Zircon is a perfect time capsule for dating those rocks,” said Blackburn. When the mineral crystallizes, it incorporates uranium, which decays over a known time with respect to the element lead. By measuring the ratio of uranium to lead in our samples, we can determine the age of those crystals, he explained.

There is evidence that the initial volcanic eruptions doubled the amount of the carbon dioxide in the atmosphere, which led to increased global temperatures and ocean acidification, he noted. This happened quickly, which probably didn’t give organisms at the time much of a chance to adjust to the changes.

he is best known as a leading proponent of Traditionalism, a worldview popular in far-right and alternative religious circles that believes progress and equality are poisonous illusions.

Evola became a darling of Italian Fascists, and Italy’s post-Fascist terrorists of the 1960s and 1970s looked to him as a spiritual and intellectual godfather.

They called themselves Children of the Sun after Evola’s vision of a bourgeoisie-smashing new order that he called the Solar Civilization. Today, the Greek neo-Nazi party Golden Dawn includes his works on its suggested reading list, and the leader of Jobbik, the Hungarian nationalist party, admires Evola and wrote an introduction to his works.

The first evidence to raise significant questions about the Clovis model emerged in the late 1970s, when the anthropologist Tom Dillehay came across a prehistoric campsite in southern Chile called Monte Verde. Radiocarbon dating of the site suggested that the first campfires were lighted there, all the way at the southern tip of South America, well before the first Clovis tools were made

Professor Waters announced finding dozens of stone tools along a Texas creekbed. After using a technique that measures the last time the dirt around the stones was exposed to light, Professor Waters concluded, in a paper in Science, that the site was at least 15,000 years old — which would make it the earliest reliably dated site in the Americas.

Having compared the DNA of modern American Indians with that of groups living in Asia today, scholars have estimated that the last common ancestor of the two peoples probably lived between 16,000 and 20,000 years ago. That figure doesn’t square with the arrival of the Clovis people from Asia only 13,500 years ago.

just as people look different from one another today, so did early hominids look different from one another, and the dissimilarity of the bones they left behind may have fooled scientists into thinking they came from different species.

the differences between these fossils were no more pronounced than those between any given five modern humans or five chimpanzees. The hominids who left the fossils, they noted, were quite different from one another but still members of one species.

“Since we see a similar pattern and range of variation in the African fossil record,” Dr. Zollikofer continued, “it is sensible to assume that there was a single Homo species at that time in Africa.” Moreover, he added, “since the Dmanisi hominids are so similar to the African ones, we further assume that they both represent the same species.”

In a book to be published in April, “The Origins of Political Order,” Francis Fukuyama of Stanford University presents a sweeping new overview of human social structures throughout history, taking over from where Dr. Wilson’s ambitious synthesis left off.

he explicitly assumes that human social nature is universal and is built around certain evolved behaviors like favoring relatives, reciprocal altruism, creating and following rules, and a propensity for warfare.

Because of this shared human nature, with its biological foundation, “human politics is subject to certain recurring patterns of behavior across time and across cultures,” he writes. It is these worldwide patterns he seeks to describe in an analysis that stretches from prehistoric times to the French Revolution.

East and west have always been geopolitical constructions whose shifting cultural meanings - from the conflict between Catholic and Orthodox Christianity in the early Middle Ages to the current obsession with China - reflect changing patterns of power. A classical archaeologist by training, Ian Morris begins this highly ambitious volume by returning to prehistoric times, when east and west were geographical expressions. For Morris, "the west" means the societies that expanded "from the original core in south-west Asia to encompass the Mediterranean Basin and Europe, and in the last few centuries America and Australasia, too", while "the east expanded from its original core between China's Yellow and Yangtze rivers, and today stretches from Japan in the north into the countries of Indochina in the south".

he offers a materialist explanation, with the aim of developing nothing less than a law-governed science of history.

In Morris's account, the ultimate origin of the west's primacy is to be found in the domestication of plants and animals that occurred in the western core around 9500BC, some 2,000 years before it did in the east. He is far from claiming that geography is destiny in any simple sense. As he points out, the meaning of geography changes along with technological and social development. Five thousand years ago, society was developing most rapidly in Egypt and Mesopotamia, and the geographical location of Portugal, Spain, France and Britain - "stuck out from Europe into the Atlantic" - was a great disadvantage. But when, 500 years ago, new kinds of ships appeared that could cross what had always been impassable oceans, sticking out into the Atlantic became highly advantageous

Researchers here say they have unearthed stone tools proving that humans reached what is now northeast Brazil as early as 22,000 years ago. Their discovery adds to the growing body of research upending a prevailing belief of 20th-century archaeology in the United States known as the Clovis model, which holds that people first arrived in the Americas from Asia about 13,000 years ago.

Paleontologists in Uruguay published findings in November suggesting that humans hunted giant sloths there about 30,000 years ago. All the way in southern Chile, Tom D. Dillehay, an anthropologist at Vanderbilt University, has shown that humans lived at a coastal site called Monte Verde as early as 14,800 years ago.

Dr. Guidon, the Brazilian archaeologist who pioneered the excavations, asserted more than two decades ago that her team had found evidence in the form of charcoal from hearth fires that humans had lived here about 48,000 years ago.

Dr. Willerslev and his colleagues wondered if some of the nonhuman DNA they had collected from Bronze Age remains might belong to pathogens. They decided to look for traces of Yersinia pestis, even though the earliest evidence of the infection dates to thousands of years later.

sometimes long shots pay off. Of 101 Bronze Age individuals, the researchers found Yersinia pestis DNA in seven. Plague DNA was present in teeth recovered from sites stretching from Poland to Siberia.

The bacterium did have many of the genes that make it deadly to humans. Dr. Wagner suggested that people may have become infected with plague in ancient times not by fleas, but bybreathing in the microbes or by hunting infected rodents for food.

Llamas and his colleagues figured out when the initial American settlers left Siberia via the land bridge over what is now the Bering strait. Their answer: roughly 23,000 years ago.

From there, it seemed that a group of about 2,000 child-bearing women (suggesting a population of some 10,000 people total) spent the next 6,000 years in genetic isolation — meaning that they weren’t intermarrying with other groups or branching off into separate ones. They just hunkered down together, and lived as their ancestors did.

That matches most scientists’s understanding of the early colonization of the Americas. In 20,000 BC, Alaska and pretty much all of Canada would have been encased in a vast ice sheet. Traversing it was impossible — nothing could survive the 3,000 mile trek across a barren glacier, let alone a motley crew of prehistoric humans.

Once considered intellectually inferior to modern humans, Neanderthals have enjoyed an image makeover in recent years thanks to new research.

Experts now think the stocky hunters crafted complex tools, buried their dead, spoke a language and expressed themselves artistically.

most individuals alive today are part Neanderthal

19th of September, 1991 was an important date for shoe history. On this day, a mummy was found in a glacier in the Ötztal Alps. Researchers also discovered a pair of well-preserved primitive shoes on so-called Ötzi's feet. The shoe uppers were made of deerskin, the insides of the shoes were made of woven linden bast, the cushioning and isolating layers were made of grass fibres, and the soles were made of bearskin. The footwear was estimated to be roughly 5,300 years old. This discovery, combined with research conducted upon 40,000-year-old Chinese skeletons as well as paintings found in the Altamira Cave dating back to 15,000 - 12,000 B.C., demonstrates that humans developed the need to protect their feet from the elements quite early on.

shoe history cannot be traced back to a single, original shoe. Different climactic regions required different kinds of footwear, from animal furs wrapped around the feet and calves to palm leaves bound beneath the foot. These kinds of early shoes offered protection from the cold and heat, respectively. In cold regions inventions like these were the predecessors of boots, whereas in hot regions they served as the prototypes for sandals. As such, shoe development was strongly influenced by respective conditions.

Hunter-gatherers were prehistoric nomadic groups that harnessed the use of fire, developed intricate knowledge of plant life and refined technology for hunting and domestic purposes as they spread from Africa to Asia, Europe and beyond.

tools and settlements that teach us about the hunter-gatherer diet and way of life of early humans.

evidence of their activities dating as far back as 2 million years ago

Rafael Núñez, a cognitive scientist at the University of California, San Diego, and one of the leaders of QUANTA, accepts that many animals might have an innate appreciation of quantity. However, he argues that the human perception of numbers is typically much more sophisticated, and can’t have arisen through a process such as natural selection. Instead, many aspects of numbers, such as the spoken words and written signs that are used to represent them, must be produced by cultural evolution — a process in which individuals learn through imitation or formal teaching to adopt a new skill (such as how to use a tool).

Although many animals have culture, one that involves numbers is essentially unique to humans. A handful of chimpanzees have been taught in captivity to use abstract symbols to represent quantities, but neither chimps nor any other non-human species use such symbols in the natural world.

during excavations at Border Cave in South Africa, archaeologists discovered an approximately 42,000-year-old baboon fibula that was also marked with notches. D’Errico suspects that anatomically modern humans living there at the time used the bone to record numerical information. In the case of this bone, microscopic analysis of its 29 notches suggests they were carved using four distinct tools and so represent four counting events, which D’Errico thinks took place on four separate occasions1.