My review of this book is now available on my website. Everett is an academic linguist who has lived for long periods with an Amazonian, people, the Pirahãs. He started as a missionary but failed to convert any of the people; instead, they converted him and he is now an atheist. The Pirahãs are unusual, if not unique, in lacking anything we would call a religion. This book is definitely one of the best I have read this year; it made me question my assumptions about many things.