This is an educational book as are Greene's other works so I'm very disappointed by how indoctrinated he is in left-wing politics. For example, he pushes global warming on the reader without mentioning that we have no solutions for global warming at present (we can't lower the sun's temperature) and also that while warming or cooling are not disputed, what is disputed is whether man's activity is to blame for variations in temperature. He acts as if we're not solving this long-term problem today which is not true. Greene also has an interesting chapter on out-grouping, but refuses to examine sex-based differences in out-grouping. He attacks nationalism and closes it by saying that tribal affiliations are "regressive" but we all have them. No country recognizes the rights of American citizens apart from America. Leftists may say they are citizens of the world but no other nation recognizes their rights (apart from their own). That's another reason why the USA is flooded with immigrants each year. Greene should be honest and put a disclaimer in the preface for his politics. Had he called it "the leftist laws" I would have skipped the purchase.