Skip to main content

How Many Licks? – Aaron Santos ****

Author Aaron Santos takes on the rarely considered but entertaining job of solving Fermi problems: making back-of-an-envelope estimates of numbers that range from the trivial, like the number of licks need to reach the centre of the lolly in the title of the book, to questions like ‘How many babies are born every day?’ The full title is ‘How many licks, or how to estimate damn near anything.’
I thought this might prove a bit samey after a while – there are 69 problems in all, ending in estimating which uses more silicon in the USA, computer chips or silicone implants (I know silicone isn’t the same as silicon, but it does contain it). In fact, each time I wanted to turn on and get to the next one.
The more enthusiastic may want to try to work out some of these as they go along. I was happy to take Santos’ word for it and just enjoy the ride. I do occasionally do this sort of thing for real, but I didn’t particularly want to do so for the problems cited here.
If there’s any complaint it was a slight inconsistency in deciding whether or not to make the assumption that ‘the United States of America’ and ‘the world’ are the same thing (this is, if assumed, not a great piece of estimating on the author’s part). So, for instance, when answering ‘How much deforestation would result each year if people chopped down their (Christmas) trees from a forest rather than getting an artificial tree or getting one from a tree farm?’ the question appears to apply to the whole world, but Santos bases his estimate of ‘How many people get real Christmas trees each year?’ on a percentage of the US population.
That apart, it was fun all the way. The book appears to have been professionally published, though it does rather have the feel of a self-published volume – it’s a little flimsy and unusual in the layout – but seems to have been properly edited and the illustrations and formulae are neatly done.
All in all an enjoyable gift book, or some light reading if you like the idea of playing around with estimating… or just want to be surprised how relatively easy it is estimate some surprisingly obscure numbers.
Paperback:  
Review by Brian Clegg

Comments

Popular posts from this blog

Quantum Space: Jim Baggott *****

There's no doubt that Jim Baggott is one of the best popular science writers currently active. He specialises in taking really difficult topics and giving a more in-depth look at them than most of his peers. The majority of the time he achieves with a fluid writing style that remains easily readable, though inevitably there are some aspects that are difficult for the readers to get their heads around - and this is certainly true of his latest title Quantum Space, which takes on loop quantum gravity.

As Baggott points out, you could easily think that string theory was the only game in town when it comes to the ultimate challenge in physics, finding a way to unify the currently incompatible general theory of relativity and quantum theory. Between them, these two behemoths of twentieth century physics underlie the vast bulk of physics very well - but they simply can't be put together. String theory (and its big brother M-theory, which as Baggott points out, is not actually a the…

Beyond Weird - Philip Ball *****

It would be easy to think 'Surely we don't need another book on quantum physics.' There are loads of them. Anyone should be happy with The Quantum Age on applications and the basics, Cracking Quantum Physics for an illustrated introduction or In Search of Schrödinger's Cat for classic history of science coverage. Don't be fooled, though - because in Beyond Weird, Philip Ball has done something rare in my experience until Quantum Sense and Nonsense came along. It makes an attempt not to describe quantum physics, but to explain why it is the way it is.

Historically this has rarely happened. It's true that physicists have come up with various interpretations of quantum physics, but these are designed as technical mechanisms to bridge the gap between theory and the world as we see it, rather than explanations that would make sense to the ordinary reader.

Ball does not ignore the interpretations, though he clearly isn't happy with any of them. He seems to come clo…

Everything You Know About Planet Earth is Wrong - Matt Brown ****

This is the latest of a series of 'Everything You Know About... is Wrong' books from Matt Brown. Although I always feel slightly hard done by as a result of the assertion in the title, as there are certainly things here I know that aren't wrong (I mean, come on, the first corrected piece of 'knowledge' is that 'The Earth is only 6,000 years old' and I can't imagine many readers will 'know' that), it's a handy format to provide what are often surprisingly little snippets of information that are very handy for 'did you know' conversations down the pub (or showing up your parents if you're a younger reader).

Some of the incorrect statements that head each article are well-covered, if often still believed (for example, people thought that world was flat before Columbus), some are a little tricksy in the wording (such as seas have to wash up against land) and some are just pleasantly surprising (countering the idea that gold is a rar…