Why The Ambidextrous Universe is a masterpiece of science writing

I have a gripe with a certain kind of popular science book about physics, maths and, occasionally, chemistry. They seem to be written for people who don’t really want to encounter any physics, maths or chemistry at all. Numbers are whisked away. Graphs disappear. Probabilities, vectors and fields are mentioned only when absolutely unavoidable. And readers are kept safe from a notion they would rather forget: that these ideas really can be understood by almost anyone, but the price of admission is effort. It is the bane of any physics editor. It is why people like me so often resort to metaphor instead of explanation. Don’t fret, we say, space-time is just a rubber sheet sagging beneath a bowling ball. Entropy is a sandcastle gradually crumbling away. And the Higgs field? Well, imagine everything wading through sticky honey. It betrays a lack of confidence not only in science’s ability to enthral, but in the writer’s ability to explain it with clarity and conviction. I am guilty of all this, and will have to live with the shame. I am convinced that the only sinless science writer is Martin Gardner. The prolific writer behind Scientific American’s Mathematical Games column was quite happy to make his readers work, and nowhere is that clearer than in his masterpiece: The Ambidextrous Universe (1964). Advertisement In a sentence, this is a book about left and right. More precisely, it is about a property of mathematical and physical systems known as handedness, or chirality. By chipping away at that one apparently simple idea, Gardner leads us into a breathless range of science. There are molecules built from the same atoms but arranged as mirror images, sometimes with dramatically different biological effects. There is the weak nuclear force, responsible for certain forms of radioactive decay. Simply put, some of these fundamental particle interactions don’t behave the same way when viewed in a mirror – in sheer violation of what seemed to be one of nature’s most basic symmetries. But Gardner never stoops to the old trick of offering up a metaphor only to hurry past the underlying idea. His explanations have a depth that is rare in popular science. It is a book that pushed me when I first read it as a student, and still stretches me whenever I return to it. Gardner does demand that you follow arguments that he carefully constructs to be lucid and insightful, but nevertheless technical. Yet every modicum of effort the reader expends, Gardner pays back tenfold, revealing how one deceptively simple distinction reaches deep into the structure of the universe. The opening chapters do the necessary groundwork. Gardner first asks what we really mean by a mirror reflection, stripping away the intuition that comes from simply looking at our hands. Then he moves into what is no doubt familiar territory for him – mathematical games, puzzles and brain-teasers – that help build confidence in manipulating the concept of handedness to solve problems. From there, the scope widens dramatically. Left-right asymmetries crop up throughout biology: in snails whose shells coil preferentially in one direction, in the chemistry that allows our bodies to process one molecular form but not its mirror image, and, of course, in our own tendency to favour one hand over the other. It is a gentle but rigorous education, before Gardner takes off the kid gloves. The book moves into the geometries of crystals and molecules, and eventually towards one of the great shocks of 20th-century physics: the discovery that the weak nuclear force violates parity, meaning that, at a fundamental level, nature really can tell left from right. The chapters range widely enough that many could almost stand alone. Yet the book never feels like a collection of disconnected ideas. Instead, there is a remarkable sense of continuity and escalation. Gardner keeps peeling away layers of handedness, beginning with its obvious manifestations in the world around us and ending somewhere much more abstract and essential. That is the undeniable charm in The Ambidextrous Universe. A distinction that initially seems almost trivial – left versus right – turns out to connect mathematics, chemistry, biology and fundamental physics. Along the way, Gardner brings in everything from poetry and puzzles to the evolution of life and the deepest symmetries of nature. Some of the individual ideas will inevitably be familiar to some readers, but I doubt that matters. The pleasure of this book lies in seeing how they fit together. Its breadth is such that almost everyone will find something they didn’t know, while its argument leaves you looking at something as ordinary as your own two hands rather differently. [Image text:] NELDS MARTIN GARDNER The Ambidextrous Universe Left. Riaht. and the Fall of Parity ASS c