This book has some great brief bursts of interesting and creative insights into topics such as tattoos, hospitality, pets, friendships and toys. Saad can be quite interesting in analyzing why we eat as if there's no tomorrow. But the book is uneven, and long stretches are dull. Saad is an atheist and traces everything to Darwin evolutionary causes. Comparisons between animals and humans abound. He posits that humans act devoid or morality, and some theories (e.g. men who view porn treat women better than men who don't) are dumb. Saad ventures into areas outside his expertise, particularly religion. He believes teaching children about God is tantamount to child abuse. He should have stuck to verifiable research.