Skip to main content

The Book of Time – Adam Hart-Davis ****

There seems to be a new breed of popular science book around aimed at families. These range from the ‘for children but adults will like it too’ book like Richard Dawkins’ The Magic of Reality to ‘for adults but children will like it too’ in the case of my own Inflight Science. I’d put Adam Hart-Davis’s latest in the latter category. It is pitched at adults, but never gets so heavy that older children would appreciate it too.
What’s more, the format is one that seems designed to appeal to those younger readers. It’s the size of a small coffee table book and has pages that have the sort of mix of text, photographs, zappy little mottos and factoids that you would expect to find in a children’s science book. The contents, though, are meaty enough for an adult reader to get their teeth into them – which is just as well, as, in writing about time, Hart-Davis is taking on a non-trivial topic.
One of the hardest things about time is to define what it is, especially up front where you can’t really go into block universes or the ‘becoming present’ and other philosophical concepts. However before long we are launched into the philosophical side and beginning to get a feel for the way human beings have struggled with the concepts of time since the earliest days through to modern philosophy. We then move on to time in nature, how we fix the units of time, how we measure the passing of time and a ‘time and science’ section that pulls together the various scientific implications and considerations of time from the speed of light and relativity to the big bang.
On the whole this all handled very well, at a level that won’t challenge, but will keep the interest going with some truly fascinating factoids and entertaining histories. I was slightly surprised that there was nothing much about thermodynamics with its implications for ‘time’s arrow’, but most of the important areas were covered. One of the difficulties in taking a relatively light approach is not over-simplifying. This doesn’t happen often, but, for instance, in talking about pendulums, there is no mention that Galileo’s idea that the period of pendulum does change with the size of its swing is wrong (despite often being repeated). In a conventional pendulum it only holds true for a small swing – once the pendulum moves more than about 15 degrees either side of the vertical, the force acting on it cease being linear, no longer producing a consistent frequency.
There is also one out-and-out error. We are told that, because of special relativity, the clocks on GPS satellites run slow by about 38 microseconds a day. Unfortunately, GPS satellites are also subject to general relativity – and this says that with lower gravity, clocks run faster. The lower gravitational pull on the satellites compared with the Earth’s surface means that they run fast, and this effect is stronger than the slowing from special relativity. In reality, the combination of the two effects means that GPS satellites run fast by 38 microseconds each day.
My only other concern is that as an adult reader, I find the busy visual presentation something of a distraction. I have nothing against illustrations in a book, but when you are having to jump here and there to read boxes and quotes and factoids, I find I lose the flow and don’t really get into the book in the same way I would with a conventional layout. I know this isn’t a problem for everyone – if you like this kind of layout, you will love this book – but it’s not my favourite approach.
Overall, this is an excellent introduction to the concepts of time, measuring it and its importance to science. It is pitched just right so that an adult can feel they are getting some worthwhile material, but a younger reader can also enjoy it. There is plenty to capture the interest, and a good balance of the historical and the scientific. Although the approach won’t work for everyone, and occasionally can over-simplify, I would still heartily recommend it, as time is subject that really isn’t covered enough in popular science.
Hardback:  
Also in paperback:  
Review by Brian Clegg

Comments

Popular posts from this blog

De/Cipher - Mark Frary ****

I was a little doubtful when I first saw this book. Although it has the intriguing tagline 'The greatest codes ever invented and how to crack them' the combination of a small format hardback and gratuitous illustrations made me suspect it would be a lightweight, minimal content, Janet and John approach to codes and ciphers. Thankfully, in reality Mark Frary manages to pack a remarkable amount of content into De/Cipher's slim form.

Not only do we get some history on and instructions to use a whole range of ciphers, there are engaging little articles on historical codebreakers and useful guidance on techniques to break the simpler ciphers. The broadly historical structure takes the reader through basic alphabetic manipulation, keys, electronic cryptography, one time pads and so on, all the way up to modern public key encryption and a short section on quantum cryptography. 

We even get articles on some of the best known unsolved ciphers, such as the Dorabella and the Voynich ma…

Cosmology for the Curious - Delia Perlov and Alex Vilenkin ***

In the recently published The Little Book of Black Holes we saw what I thought was pretty much impossible - a good, next level, general audience science title, spanning the gap between a typical popular science book and an introductory textbook, but very much in the style of popular science. Cosmology for the Curious does something similar, but coming from the other direction. This is an introductory textbook, intended for first year physics students, with familiar textbook features like questions to answer at the end of each chapter. Yet by incorporating some history and context, plus taking a more relaxed style in the writing, it's certainly more approachable than a typical textbook.

The first main section, The Big Bang and the Observable Universe not only covers basic big bang cosmology but fills in the basics of special and general relativity, Hubble's law, dark matter, dark energy and more. We then move onto the more speculative (this is cosmology, after all) aspects, brin…

Paul McAuley - Four Way Interview

Paul McAuley won the Philip K. Dick Award for his first novel and has gone on to win the Arthur C. Clarke, British Fantasy, Sidewise and John W. Campbell Awards. He gave up his position as a research biologist to write full-time. He lives in London. His latest novel is Austral.


Why science fiction?

For one thing, I fell in love with science fiction at an early age, and haven’t yet fallen out of love with it (although I have flirted with other genres). For another, we’re living in an increasingly science-fictional present. Every day brings headlines that could have been ripped from a science-fiction story. Giant robot battle: Who knew a duel between chainsaw-armed mech suits could be so boring? for instance. Or, Roy Orbison hologram to embark on UK tour in 2018. And looming above all this, like Hokusai’s famous wave, are the ongoing changes caused by global warming and climate change, which is just one consequence of human activity having become the dominant force of change on the planet…