temps (durée) (1) temps libre (1) évolution (1) énergie (1) Costs (1) Acquisition (1) Hominids (1) Bipedalism (1) Rates (1) Time (1) Social learning (1) Social interaction (1) Social evolution (1) Power resources (1) Power (Mechanics) (1) Human beings (1) Life (1) Leisure (1) Hunting and gathering societies (1) Force and energy (1) Finance (1) Fertility (1) Farmers (1) Evolution (1) Comprehension (1) Adaptations (1) Adaptations (1) Finance (1) Use (1) Evolution (1)