Humans have quite large brains for their body size. One of the evolutionary questions is "why did such big brains, which consume a lot of calories evolve?" What data does the article use to explore the question as to why we evolved such large brains? Primates live socially complex lives. What is the Machiavellian hypothesis for large brains and high cognitive functioning? Does the Machiavellian hypothesis give you insight or strategies into how to negotiate your primate (human) society? Does the author think big brains evolved in primates to aid them in getting food for survival? What is his preferred hypothesis for how and why big brains evolved in primates? How does the author test his hypothesis? Reference at least one specific example. What is a homology (text)?]