Forward's book is a knockout. In science fiction there is only a handful of books that stretch the mind--and this is one of them! --ARTHUR C. CLARKE Bob Forward writes in the tradition of Hal Clement's Mission Gravity and carries it a giant step (how else?) forward. --ISAAC ASIMOV Dragon's Egg is superb. I couldn't have written it; it required too much real physics. --LARRY NIVEN This is one for the real science-fiction fan. --FRANK HERBERT Robert L. Forward tells a good story and asks a profound question. If we run into a race of creatures who live a hundred years while we live an hour, what can they say to us or we to them? --FREEMAN J. DYSON Author of Disturbing the Universe Forward has impeccable scientific credentials, and . . . big, original, speculative ideas. --The Washington Post