John D. Speth

TL;DR: This analysis showed that whenever and wherever it was ecologically possible, hunter-gatherers consumed high amounts (45-65% of energy) of animal food, which produces universally characteristic macronutrient consumption ratios in which protein is elevated at the expense of carbohydrates.

TL;DR: Experimental data indicate that although both protein and fat enhance high-protein, low-energy diets, carbohydrate is a more effective supplement than fat.

TL;DR: This paper argues that meat may actually have been a relatively marginal source of sustenance for early hominids, because physiological limits to total protein intake, scarcity of fat in most African ungulates, and comparatively high levels of protein in many plant foods, acted together to maintain their total meat intakes at modest levels, particularly during seasonal or inter-annual periods of resource stress.

TL;DR: In this paper, it is found that a percussion flake is detached from a core largely by a process known as spalling, the fracture produced by the reflection of a stress wave at the free surface of the core adjacent to the striking platform.