Becoming Human - Last Human Standing - Ep 3 - Full Documentary

Humans, the smartest animal on Earth, are tied to their ape origins millions of years ago. Our journey from ape to modern human involved at least 20 types of human ancestors. While some were evolutionary dead ends, Homo sapiens survived, leading to the question of why we are the last humans standing. New discoveries illuminate the final stages of our evolution, revealing that all modern humans descend from a small population of approximately 600 breeding individuals in Africa. We are also learning how Homo sapiens spread globally, displacing other ancient humans like Neanderthals.

For almost 400,000 years, Neanderthals thrived in Ice Age Europe, possessing larger brains than modern humans and a remarkable survival record. They were the most advanced humans until the arrival of Homo sapiens, after which they mysteriously vanished. Discoveries, such as the remains of a 100,000-year-old child, are helping to understand the differences between Neanderthals and us. This includes insights into their physical abilities, cognitive development, and cultural practices. Neanderthals were robust hunters, but their technology remained basic, primarily using thrusting spears for close-range hunting, leading to frequent injuries and shorter lifespans. Despite their longevity as a species, their time ended around 25,000 years ago.

Homo erectus, appearing on African plains almost 2 million years ago, were the first ancestors with body structures similar to ours, characterized as hunter-gatherers and toolmakers living in social groups. The famous 'Turkana Boy' fossil exemplifies this stage of evolution. Homo erectus was likely the first to migrate out of Africa, leading to various distinct populations, including the 'Hobbit' in Indonesia and early humans in China. A subsequent wave from Africa gave rise to Homo heidelbergensis in Europe, which would eventually evolve into Neanderthals. Extraordinary finds at Atapuerca, Spain, including the 'Pit of Bones,' suggest that Homo heidelbergensis possessed complex minds capable of symbolic behavior, as evidenced by intentional burial practices and the 'Excalibur' hand axe. This pushes back the timeline for sophisticated mental evolution by almost half a million years.

The Great Rift Valley in Africa, a cradle of human evolution, saw the emergence of Homo sapiens around 200,000 years ago. Initially, their tools were simple and similar to Neanderthals. A pivotal change occurred due to severe climate upheaval, including mega-droughts, around 140,000 years ago, pushing early Homo sapiens to the brink of extinction. This 'bottleneck effect' is evident in the low genetic diversity of modern humans. Survivors sought refuge in coastal and highland areas, developing new adaptable behaviors. Specifically, at Pinnacle Point, South Africa, evidence shows early humans broadening their diet to include shellfish, requiring advanced knowledge of tidal patterns and lunar cycles. This signifies a new versatility and cognitive complexity.

The development of sophisticated tools and symbolic thinking was crucial for Homo sapiens. At Pinnacle Point, stone tool technology advanced significantly, including the heating of silcrete to improve flaking and the creation of specialized tools for various tasks. These tools became more than just utilitarian objects; they served as symbols carrying social information. The discovery of decorative art, such as engraved red ochre and shell beads, at Blombos Cave, indicates the emergence of symbolic consciousness and the ability to store information outside the human brain. This marked the birth of a new, more complex, and easily transmissible human culture.

Around 60,000 years ago, with new technology and culture, Homo sapiens began to migrate out of Africa, populating continents already inhabited by other human species. In Europe, they encountered Neanderthals. Genetic analysis, particularly the sequencing of the Neanderthal genome by Svante Pääbo's team, indicates that Homo sapiens and Neanderthals share a common ancestor, Homo heidelbergensis, dating back 300,000-400,000 years ago. While both species possessed the FOXP2 gene linked to speech, suggesting mutual linguistic capacity, current evidence does not strongly support interbreeding between them. Instead, Homo sapiens, with their lower energy demands, advanced projectile weapons (throwing spears), and intensified exploitation of the environment, outcompeted Neanderthals. The arrival of Homo sapiens often coincided with the extinction of large animal communities and, eventually, Neanderthals themselves, making Homo sapiens the sole human species left on Earth.

Climate upheavals were a driving force in making Homo sapiens adaptable and inventive, leading to continuous technological advancements. What truly distinguishes us is not just our genes but also our unique ability to create and transmit culture. Culture provides a flexible mechanism for adaptation to various environmental challenges, unlike biological or physical changes. This cultural evolution, combined with genetic evolution, continues to shape our species. The genomic evolution rate has increased over the last 10,000 years, indicating that humanity is still a young species with a long, evolving future.