The great value of this book is that there is real,close attention to decisive detail but without the inclusion of needless and intimidating technicalities.The result is that it is never superficial and yet never inaccesible either.I know of no other book that achieves this combination so well.I have taught undergraduate courses--in the US and UK-- on reasoning in science and would certainly use material from this book if I were planning such a course in future.Justice is done to some sophisticated complexities in extremely lucid ways .I think especially of the discussion of different kinds of causes in the biology of aging ,and of genotype /environment interactions in development.This book deserves a very wide readership among students at all levels and among the general public as well .University and public libraries should certainly be getting it.