Why we happen to live on a planet that has so many nice things for our comfortable existence: oxygen, water, a temperature between the freezing and boiling points of water, and so on. Is this happy coincidence just good luck, or an act of Providence, or what?
Why the multiverse idea is so fascinating, why it does explain one aspect of our universe that has unsettled some scientists for years: according to various calculations, if the values of some of the fundamental parameters of our universe were a little larger or a little smaller, life could not have arisen.
btw, just wanted to share/ask something... all my interest in (and most of knowledge of) in this kind of stuff is based on having stumbled upon the (Russian translation) of this book about 27 years(!!) ago:
http://www.amazon.com/Search-Life-Universe-Third/dp/1891389165/
(this was before we started studying Chemistry or Phsycis or any real science in school so I was essentially "reverse engineering" the stuff in this book that was meant to follow from knowing the prerequisites)
was wondering if this book was popular here and what you think of it...