I don't know if it was done so the book title would echo 'age of empire' , but I find the author's term for uploaded personalities 'ems' a little contrived, like many made-up names - it's just a bit too short for what he covers. (And sounds far too like a shortening of Emma.) However there is no doubt that what Hanson is doing here is truly fascinating. It is far more than the lame subtitle 'work, love and life when robots rule the Earth' suggests, as is it's not about robots. It is attempting to forecast the nature of a world dominated by electronic 'people', initially created by uploading the mental patterns of humans.
What Hanson does brilliantly is to take the reader through all the different implications of such a world. Implications that simply won't have occurred even to many science fiction writers. What, for example, would happen if a single person is copied many times to make a slave army? How would the ems interact socially? What would their civilisation be like? I've never seen a book that took this idea to such a detailed logical extreme.
Unfortunately, despite the brilliance of the concept, the execution is not at the same level. It's like a non-fiction equivalent of Tolkien's The Silmarillion. If you are interested in the subject, it feels like something that ought to be a delight, but in fact the plodding academic writing, based on making repeated statements with no narrative flow, make it a pain of a book to read. We get exactly the same here as in The Silmarillion, with the added joy of inline Harvard-style references, which make it even harder to get any pleasure from reading it.
I think the best way to describe The Age of Em as is as a theory of science fiction book. Although Hanson is of the opinion that his vision of a world dominated by uploaded personalities will be possible within 100 years, I suspect that the complexity of scanning a brain to the level of individual neurons, their connections, their chemical makeups and electrical balances will take rather longer to achieve. What's more, the author proudly tells us that he intends to have his brain frozen when he dies with the hope of one day becoming an em. If making this happen with living people is difficult, the chances of a personality remaining in a frozen brain that could even approximate to the original are negligible - think more of the episode in Buffy the Vampire Slayer when her dead mother is brought back. Not advisable.
The other reason I'd label this theory of science fiction is that the whole business of futurology has always been terribly inaccurate. Niels Bohr was spot on when he said 'predictions can be very difficult - especially about the future.' Hanson attempts to defend the accuracy of futurology by pointing out specific examples that have come up with a surprisingly accurate prediction. But when you look at those examples, the accuracy is mostly retrofitted with hindsight. More to the point, this is a classic example of the scientific no-no of cherry picking. You don't show that something is effective by picking out the handful of cases where it has worked and ignoring the many thousands where it hasn't worked. Statistically, some guesses about the future are bound to be correct - but that doesn't make them accurate forecasts, it makes them lucky.
So don't expect a great work of popular science (to be fair, given those inline references, I don't think the author intended it to be popular science). But if you can put the effort in and grind through it, there are some genuinely fascinating considerations about what a society of uploaded individuals might be like. In fact, I'd say any science fiction author worth his or her salt should be rushing out and buying a copy of this book. There are enough ideas here to spark off a thousand stories.
Review by Brian Clegg