>>> ... - dunno if there's any real statistics behind this stuff or not
Well, if you have some time, here's a start! They talk about various physical characteristics and how they became survival features, among other things.
https://www.amazon.com/Encounter-Anthropology-Robin-Fox/dp/0151287937/ref=sr_1_2?s=books&ie=UTF8&qid=1468690159&sr=1-2&keywords=encounter+with+anthropology
Excerpt from Google books:
https://books.google.com/books?id=bXAaXWTR5EMC&pg=PA7&lpg=PA7&dq=encounter+with+anthropology&source=bl&ots=7x9WhGyJIt&sig=6z1xIG5T05bC6n-c7xQWdJ-PK4M&hl=en&sa=X&ved=0ahUKEwiAzdG8wvjNAhVj7YMKHWK0B8IQ6AEIQDAF#v=onepage&q=encounter%20with%20anthropology&f=false
Well, if you have some time, here's a start! They talk about various physical characteristics and how they became survival features, among other things.
https://www.amazon.com/Encounter-Anthropology-Robin-Fox/dp/0151287937/ref=sr_1_2?s=books&ie=UTF8&qid=1468690159&sr=1-2&keywords=encounter+with+anthropology
Excerpt from Google books:
https://books.google.com/books?id=bXAaXWTR5EMC&pg=PA7&lpg=PA7&dq=encounter+with+anthropology&source=bl&ots=7x9WhGyJIt&sig=6z1xIG5T05bC6n-c7xQWdJ-PK4M&hl=en&sa=X&ved=0ahUKEwiAzdG8wvjNAhVj7YMKHWK0B8IQ6AEIQDAF#v=onepage&q=encounter%20with%20anthropology&f=false