What to say about a classic that hasn't already been said? The science, as you would expect from Asimov, is clearly explained and - as fair as I can tell - accurate. The characters are believable, mostly likeable, and a little over-the=top at times. I especially like the middle "alien" section of the book, which is the part I remember best from previous readings., although I do have some reservations about the denouement of that section. Enjoyable.