200 - 300 pgs

Diversity of Features: Lordkipanidze and colleagues emphasize that the Dmanisi hominins exhibit a blend of primitive and derived characteristics.
- Brain Size: Ranges from 546 to 775 cc, indicating relatively small brain size compared to modern humans.
- Shoulder Morphology: Retain primitive traits; unlike modern humans, whose elbow joint allows palms to face inward, the Dmanisi hominins' palms are positioned more front-facing.
- Lower Limb Morphology: Displays several derived features aligned with modern humans:
- Identical limb proportions as modern humans.
- Adaptations for long-distance walking and running:
  - High femoral-to-tibia and humeral-to-femoral ratios.
  - Well-developed arches in the feet.
  - Adducted big toe, which is inline with other toes.

Timeline: Homo erectus arrived in eastern Asia between 1.8 million years ago (Ma) and 1.6 Ma.
Discovery: Eugène Dubois discovered the first Homo erectus fossils near the Solo River in Java during the 19th century and named it Homo erectus meaning "erect man."
- Initial Dating: Early datings of Dubois’s fossils suggested an age of about 500,000 years.
- Revised Dating Techniques: In the 1990s, Carl Swisher and Garniss Curtis employed argon–argon dating on rock crystals from Dubois’s site, leading to an age correlation of these fossils dating between 1.6 Ma and 1.8 Ma.
Supportive Evidence: Discovery of two incisors at Yuanmou in southern China, resembling African H. erectus teeth and dating to roughly 1.7 Ma, supports the conclusion about H. erectus's migration into eastern Asia.

Dmanisi Hominin Traits: The skulls provide insight into their developmental patterns and features similar to both earlier and modern hominins.
- Potential for Slower Development: Homo erectus may have developed more slowly than early hominins but quicker than modern humans, as indicated by dental eruption studies.
- Molar Emergence: Researchers Kelley and Schwartz estimated the first molar (M1) erupted around 4.5 years.

Discovery: Fossil identified as a young Homo erectus, about 8 years old at the time of death.
- Postcranial Skeleton: More similar to modern humans than earlier hominins, yet still differed significantly:
- Body Proportions: Featured elongated limbs and barrel-like chest similar to extinct savannah inhabitants.
- Height Estimate: KNM-WT 15000 stood approximately 1.625 m (5.33 ft). Estimated adult height could be around 1.9 m (6 ft) depending on growth rates.
- Dimorphism: H. erectus displayed less sexual dimorphism than australopiths, suggesting around a 20-30% size difference between males and females, with caution advised due to fossil sample limitations.

Running Ability: Hypotheses by biologists Dennis Bramble and anthropologist Daniel Lieberman suggest that features like long legs and barrel-shaped chest indicate early long-distance running capabilities, potentially useful for scavenging and hunting.

Tool Use Evidence: Early hominins likely engaged in tool use, akin to apes, with chimpanzees demonstrating techniques for extracting food using various tools:
- Examples of Chimpanzee Tools: Tools made from sticks for extracting termites, nuts, and other food sources.
Earliest Stone Tools: The oldest evidence for stone tool manufacture dates back to around 3.4 Ma, with the oldest confirmed tools from Gona, Ethiopia, dating to 2.6 Ma.
Manufacture Techniques: Use of bipolar techniques, and others involving striking larger stones against smaller cores, produced tools that are historically significant.

Introduction of Oldowan Tools: Oldowan tools, dating to approximately 2.6 Ma, characterized by flaked and irregular shapes produced by striking cobbles. These tools were used for various tasks, from butchering to woodworking.
Complexity of Techniques: The more sophisticated techniques appeared later as technology evolved, leading to the emergence of bifaces (Mode 2 technology).

Bifaces and Functionality: Starting around 1.75 Ma, the Acheulean industry featured advanced tools such as hand axes and cleavers:
- Distinct Forms: Hand axes were designed with consistent shapes, reflective of the cognitive planning of their makers.
- Diversity of Uses: These tools may have been used for butchering, flake dispensers, or woodworking tasks.

Lateral Development of Skills: The dependency on extracted and hunted foods in early hominins suggests a significant advancement in social behaviors.
Food sharing: Emerged as crucial for navigating environmental challenges, driving behavioral adaptations linked to communal living and division of labor.

Control of Fire: Although controversial regarding its timeline, the ability to use fire for cooking and warmth likely played a critical role in supporting larger brains and providing nutritional adaptability in varying climates. Evidence suggests sporadic use around 1 Ma, but regular usage may not have materialized until around 300 ka.

Support for Butchery Hypothesis: Archaeological findings at various sites indicate evidence of internal structures consistent with foraging community behavior, contrasted with mere butchery sites where hominins processed meat.
Evidence of Home Bases: The interpretations regarding the significance of these archaeological sites help reconstruct the social and economic lives of early hominins.

Occipital Torus: Located at the back of the cranium, a ridge of bone indicating features unique to certain hominins.
Flakes, Cores, Knapping: Techniques and terms relevant to the production and use of stone tools across different temporal modalities, specifically within the Oldowan and Acheulean tool industries.