2. Genome sizes vary tremendously in ways that do not obviously relate to organism complexity, e.g., many fish and amphibians have huge genomes compared to mammals (note that the number of base pairs on the x-axis is on a log scale):
2. The key theme is that HGs vary a lot, hence the word *Spectrum* in the subtitle, but in principled ways that are best understood in a human behavioral ecology (HBE) framework: 
2. Major points:
2. Humans start off as a single fertilized cell that, over 9 months, develops into an intricately structured, 2 trillion cell infant, and over 20 years, into a 30 trillion cell adult.
2. The Aka report having sex about 3 times a night, with some days of rest between (all data are self-reported). Here, these frequencies are converted to weekly for comparison with neighboring Ngandu farmers and the US: 
2. Slave trading forced Ngandu horticulturalists into contact w/ the Aka, with whom they live today, exchanging starchy foods for meat, honey & other forest products, which initially included ivory that was exported to global markets, increasing the status of Aka elephant hunters 
2. In the terminal Pleistocene & Holocene, Homo sapiens expanded out of Africa into somewhat genetically isolated populations in W, S, & E Asia, Oceania & the Americas pnas.org/doi/full/10.10… 
1. Conflict is a key concept in evolutionary approaches to behavior. Adaptive responses to conflict often involve costly behaviors, eg, fighting, which are NOT pathological!
2. Anthropological analyses of suicidality link many cases to (1) social conflict, and (2) a motive or goal to influence or rebuke antagonists, or seek redemption. Among the Amazonian Aguaruna, for example (Brown 1986): 
2. Most depression is caused by adversity, and both are strongly linked to *conflict*. Assault is perhaps the most potent risk factor for depression. Other depression risk factors, like marital problems, are also tied to conflict. Table from Kendler et al. 1999: 
2. White women tourists visiting the Caribbean and other warm-weather locales are stereotyped as sex-starved nymphomaniacs lusting after sexually potent dark-skinned men. Where did this myth come from? 
