i just started reading it - finished chapter 2 last night.
Chapter 1 - she follows a reincarnation researcher in India. i don't think she deals with the issue too critically. to me, they're basically seeing the selective memory of the people. in other words, a kid makes some statements, somebody realizes that these sound like so-and-so in another villiage nearby, who recently died, and so they declare the kid to be the re-incarnated dead person.
the people she sees WANT to believe it - it fits with their religion. in some ways, to them doesn't matter if it's REALLY true. it makes the families feel better, so it's ok.
chapter 2 is mostly about the discovery of egg fertilization, and a light discussion of when, exactly the soul enters into the embryo/cellular mass. some people argued for a while that the sperm is a tiny person, and the ovum (egg) is nothing more than food for it. other argued that the egg contained everything, and that the sperm was a sort of catalyst for the growth to begin.
finally, one religious scholar says that the soul doesn't enter until about the 14th day, because that's the point where the mass can no longer split into twins. if the soul entered before that point, then clearly each baby would only have 1/2 a soul..
that's my take on the book so far. it's made me laugh out loud - not at the science, but the author's comments peppered througout the book.
i'm enjoying it, but the science (so far) seems light. and the critical thinking isn't there at all just yet.