It was indeed dumbed down for the general public. I don't have a copy to hand, but I laughed like a drain at one section of the introduction: <paraphrase> "Th

It was indeed dumbed down for the general public. I don't have a copy to hand, but I laughed like a drain at one section of the introduction: <paraphrase> "This book is intended for a lay reader, but necessarily contains quite a bit of maths. Readers who prefer to avoid equations and formulas can skip chapters 4, 6, 12-20, 26 and 27". </paraphrase> Penrose's notion of a "lay reader" is one who doesn't have a maths degree.