There’s a famous video in which Richard Feynman is asked by a BBC journalist if he can explain magnetism to him, and Feynman pauses for a moment and says “no”. The journalist is totally incredulous, and demands to know what Feynman means by that, and the great scientist tells him that he knows so little of the basics, and magnetism is so deep and so tricky,1 that it would be impossible to explain much of anything without either misleading him or giving him a false understanding.
I’ve always thought that nearly all pop science books fall into one version or another of this trap. Either they abandon all attempts at explaining the difficult concept in simple terms, or they simplify and elide so much as to become actively misleading.2 I call the latter horn of the dilemma “string theory is like a taco”-syndrome, and it’s by far the more common failure case. This is because undersimplification makes your audience feel dumb, while oversimplification makes them feel smart, so you sell a lot more books by oversimplifying. Unfortunately the effects on the audience of oversimplification are far more dangerous and insidious. After reading something impenetrable, you at least still know that you don’t really understand it, so there’s still a chance for you to go on and learn it some other way. Reading an oversimplified explanation, however, can fool you into thinking that you now grasp the concept, when in reality all you’ve grasped is a lossy analogy that will lead you astray.
All of which is to say I think it’s pretty impressive how well [author David] Reich does at diving into some of the real statistical meat of his techniques while still making them comprehensible to a smart layman. He has the gift that the greatest scientific expositors possess of being able to communicate in simple terms what it is that makes a problem hard, and then also giving you the broad strokes of an elegant solution to that hard problem. He doesn’t pretend that he hasn’t left anything out, instead he points out exactly where he’s glossed over details, so that you can go back and look them up if you want. This doesn’t sound all that impressive, but it’s actually really freaking hard to pull off, especially in a field that’s new and hence hasn’t been reformulated and recondensed a hundred times until it’s turned into a crystalline version of itself.
Okay, what was your favorite interesting genetic fact that this book taught you about a contemporary population? Mine was definitely that the various Indian jatis are as genetically distinct from one another as the Ashkenazi Jews are from everybody else. Not one group, but hundreds and hundreds of groups, all living in close proximity to each other, have gone millennia with incredibly minimal genetic mixing. How is that possible? It makes me take some of the assertions made by classical Indian texts a little bit more seriously.
Jane Psmith and John Psmith, “JOINT REVIEW: Who We Are and How We Got Here, by David Reich”, Mr. and Mrs. Psmith’s Bookshelf, 2023-05-29.
1. It always bothered me when people ragged on Insane Clown Posse for expressing humility and awe at magnets. In fact their attitude is exactly the appropriate one. Back when ICP were in the news more often, I made a minor hobby of demanding that anybody who made fun of them explain magnets scientifically to me on the spot. Nobody ever succeeded.
2. And sometimes, remarkably, a pop science book manages to make both mistakes at the same time. I’m reminded of Edward Frenkel’s horrible book Love & Math, which is full of passages like: “Think of the Hitchin fibration as a box of donuts, except that there are donuts attached not only to a grid of points in the base of the carton box, but to all points in the base. So we have infinitely many donuts — Homer Simpson would sure love that! It turns out that the mirror dual Hitchin moduli space, the one associated to the Langlands dual group, is also a donut topic/fibration over the same base. Donuts. Is there anything they can’t do?”
May 31, 2025
QotD: Explaining the science to the non-scientific layperson
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