Skip to main content

The Raven's Hat - Jonas Peters and Nicolai Meinshausen ***

This book promises something intriguing - 'a series of engaging games that seem unsolvable - but that can be solved when they are translated into mathematical terms.' Such a title succeeds or fails on two key aspects of that promise - are the games engaging and are the mathematical solutions comprehensible to the general reader.

Before getting into the detail, I must say that I loved the illustrations by Malte Meinshausen, featuring characters that are an endearing cross between a raven and the old 'Spy vs Spy' illustrations in Mad magazine. As will become clear, I do have some difficulty with the content as far as the general reader is concerned, though some will definitely find it interesting.

Are the games engaging? I'd say mostly not. The first, which features hat colour guessing, is the most so, as it's just about imaginable playing it as a real game. Similarly, there's a magic trick involving a pack of cards that feels as if it could just about be usable as a genuine card trick (even though it's a card trick where the magician is said to only have 84% chance of success, which seems a bit low to be truly successful.) Those apart, though, the game formats are so convoluted that they become abstractions rather anything that's imaginable as a game you would play.

How about the solutions? They are quite difficult to get your head around and aren't broken down well enough for the non-mathematician to really grasp them. They also generally seem too complex for anyone but a maths wizard to remember how to make use of in reality. And it can also be difficult to pick up on exactly what is meant. 

So, for example, in the hat colour game, players are given red or blue hats without seeing their own hats. They can't talk to each other, but after a few seconds, when asked, they have to hold up a sign with the answer to 'What colour is your hat?' of 'Red', 'Blue' or '?'. We are then asked the best strategy, which seems to involve the players deciding together what they should do - but we were told they can't talk to each other. When it comes to solutions of this game, we are told 'the key to success will be to "collect" the wrong answers in single instances of the game' as this will bundle 'the false guesses into the same game and spread out the correct guesses over as many games as possible.' But there was no suggestion up front the game was to be played multiple times - and the concept of bundling up false guesses feels wrong, so needs more explanation.

Similarly, for the card trick, the mechanism requires the pre-ordered pack to be riffle shuffled three times. I have never seen a real card trick, where the audience member is told a mechanism for shuffling - they are just asked to shuffle the cards (personally I would alternate overhand shuffles and riffle shuffles). As soon as the mechanism is forced on them, it immediately becomes suspect.

That all sounds a touch negative - but I would stress again that those who are deeply into the theory and mathematics of games will no doubt find this book extremely intriguing. It's just that there's an opportunity missed for it to reach a wider audience.

Paperback:

Kindle:  
Using these links earns us commission at no cost to you
Review by Brian Clegg

Comments

Popular posts from this blog

We Are Eating the Earth - Michael Grunwald *****

If I'm honest, I assumed this would be another 'oh dear, we're horrible people who are terrible to the environment', worthily dull title - so I was surprised to be gripped from early on. The subject of the first chunk of the book is one man, Tim Searchinger's fight to take on the bizarrely unscientific assumption that held sway that making ethanol from corn, or burning wood chips instead of coal, was good for the environment. The problem with this fallacy, which seemed to have taken in the US governments, the EU, the UK and more was the assumption that (apart from carbon emitted in production) using these 'grown' fuels was carbon neutral, because the carbon came out of the air. The trouble is, this totally ignores that using land to grow fuel means either displacing land used to grow food, or displacing land that had trees, grass or other growing stuff on it. The outcome is that when we use 'E10' petrol (with 10% ethanol), or electricity produced by ...

Battle of the Big Bang - Niayesh Afshordi and Phil Harper *****

It's popular science Jim, but not as we know it. There have been plenty of popular science books about the big bang and the origins of the universe (including my own Before the Big Bang ) but this is unique. In part this is because it's bang up to date (so to speak), but more so because rather than present the theories in an approachable fashion, the book dives into the (sometimes extremely heated) disputed debates between theoreticians. It's still popular science as there's no maths, but it gives a real insight into the alternative viewpoints and depth of feeling. We begin with a rapid dash through the history of cosmological ideas, passing rapidly through the steady state/big bang debate (though not covering Hoyle's modified steady state that dealt with the 'early universe' issues), then slow down as we get into the various possibilities that would emerge once inflation arrived on the scene (including, of course, the theories that do away with inflation). ...

Why Nobody Understands Quantum Physics - Frank Verstraete and Céline Broeckaert **

It's with a heavy heart that I have to say that I could not get on with this book. The structure is all over the place, while the content veers from childish remarks to unexplained jargon. Frank Versraete is a highly regarded physicist and knows what he’s talking about - but unfortunately, physics professors are not always the best people to explain physics to a general audience and, possibly contributed to by this being a translation, I thought this book simply doesn’t work. A small issue is that there are few historical inaccuracies, but that’s often the case when scientists write history of science, and that’s not the main part of the book so I would have overlooked it. As an example, we are told that Newton's apple story originated with Voltaire. Yet Newton himself mentioned the apple story to William Stukeley in 1726. He may have made it up - but he certainly originated it, not Voltaire. We are also told that â€˜Galileo discovered the counterintuitive law behind a swinging o...