[NNagain] A good question - do you know how a toilet works?
Dave Taht
dave.taht at gmail.com
Wed Oct 4 14:46:52 EDT 2023
I like to think, that as we defeated cholera, and designed water and septic
systems that just work, that engineers and scientists had successfully
informed policymakers of the right things to do - not always right, the
first time!
---------- Forwarded message ---------
From: Adam Mastroianni <experimentalhistory at substack.com>
Date: Tue, Oct 3, 2023 at 1:57 PM
Subject: On the importance of staring directly into the sun
To: <dave.taht at gmail.com>
It's also important to poke the heart of a dead pigeon
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for more
On the importance of staring directly into the sun
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also important to poke the heart of a dead pigeon
Adam Mastroianni
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Oct 3
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Listen to post · 22:53
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Photo
cred: my dad
There's something very weird about the timeline of scientific discoveries
<https://substack.com/redirect/f4751026-7628-4fca-93aa-2b742761d8ec?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
.
For the first few thousand years, it’s mostly math. Maybe a bunch of math
nerds hijacked the list, but it's pretty obvious that humans figured out a
lot of math before they figured out much else. The Greeks had the
beginnings of trigonometry by ~120 BCE
<https://substack.com/redirect/d3a2ac46-c078-4314-830e-166482b86ccb?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>.
Chinese mathematicians figured out the fourth digit of pi by the year 250
<https://substack.com/redirect/67256e6c-0a90-432e-9e6a-bb8da8f511ce?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>.
In India, Brahmagupta
<https://substack.com/redirect/763e427d-25d4-4208-9ff2-76165f8cb991?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
devised a way to “interpolate new values of the sine function” in 665, and
by this point we're already at mathematics that I no longer understand.
Meanwhile, we didn't discover things that seem way more obvious until
literally a thousand years later. It's not until the 1620s, for instance,
that English physician William Harvey
<https://substack.com/redirect/6073f655-8b16-4d4a-84bf-65850374f115?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
figured out how blood circulates through animal bodies by, among other
things, spitting on his finger and poking the heart of a dead pigeon. We
didn't really understand heredity until Gregor Mendel
<https://substack.com/redirect/39f12d29-f01c-474e-889c-ba34c7e2aa40?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
started gardening in the mid-1800s, we didn't grasp the basics of learning
until Ivan Pavlov
<https://substack.com/redirect/f2955724-35ff-4ab7-adc8-30221186ebe1?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
started feeding his dogs in the early 1900s, and we didn't realize the
importance of running randomized-controlled trials until 1948
<https://substack.com/redirect/768bb3ce-a378-43a0-8eb0-54103b5b8427?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
.
Oh, and for 13 centuries, people thought that rotting meat turns into
maggots, until Francesco Redi
<https://substack.com/redirect/2184723f-13e2-4c46-9805-6b122d833fce?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
did this:
<https://substack.com/redirect/85e8013b-2d53-4fb7-bae3-67e00af16a8d?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
Nobody
thought to do this until 1668. Image credit: Amitchell125
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What took us so long? How did all this low-hanging fruit go unplucked for
centuries? Our ancestors weren't stupid—they were absolutely nailing it in
math, racking up centuries of top-notch numbers stuff, even while they were
like , “I hope my meat doesn't rot and turn into maggots.”
A very straightforward theory of how science works is “we discover things
in order from easiest to hardest.” But what makes something hard to
discover? I don't mean *impossible *to discover—you can't see the rings of
Saturn without a telescope, for example. I mean cases where it seems like
we have everything we need to make a discovery, and yet we take centuries
to make it. Why does *that* happen?
I think I have an answer, but we must unfortunately look for it in the
toilet.
*HOW DOES A TOILET WORK*
Here's one of my favorite psychology studies of all time
<https://substack.com/redirect/4a3c3b5c-a6e9-4f73-b425-3db86a3997d7?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>.
You bring people into the lab, and you ask them, “Do you know how a toilet
works?” And they say “Uhh yes, I'm not an idiot.” And then you go “Okay,
could you please write down, step by step, how a toilet works.” And then
you ask them to explain something that requires knowledge of toilets, like
“How does pressing the lever on the side of the toilet cause the bowl to
empty and then refill again to a certain level?”
What participants learn in this study is that, to their horror, they don't
really know how a toilet works, at least not nearly as well as they thought
they did. This isn't specific to toilets—you can get it with everything
from spray bottles to helicopters.
Here's one from me: I realized recently that I don’t know how things dry. I
know *that *things dry, of course—I’m not an idiot! But *why *do they dry?
If you leave a wet towel hanging in the bathroom, eventually it won’t be
wet anymore. Where does the water go? Into the air, I assume, but I thought
liquid water is only supposed to become gas when it gets hot enough.
This trustworthy-seeming
website
<https://substack.com/redirect/5fded803-44f0-4646-8470-7834ad41395c?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
informs me it's because temperature is only the *average *amount of energy
in a volume of water, and individual water molecules can have way more or
less energy than that because they're all moving around randomly, and so by
chance some are going to pick up enough energy to slip their bonds and
rocket off into the air.¹
Psychologists have a name for this tendency to think we understand things
better than we do: the “illusion of explanatory depth.” We call it an
illusion because we live inside a proto-paradigm
<https://substack.com/redirect/045df2b0-74e4-4069-b614-4ace308b1f26?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
where we catch people making mistakes and go “aha! a bias!” and then
publish a paper on it. (...he said, having recently published a paper
called “The Illusion of Moral Decline
<https://substack.com/redirect/45193b72-9123-4d92-b502-5dd33a364719?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>”.)
But this particular illusion is a feature, not a bug. In fact, we can't
live without it.
Think of it this way: for most of human history, we didn't know why things
fall down. People trip, cups spill, buildings topple, and nobody had any
good explanations for this, or at least not any true ones. If you didn't
have an illusion of explanatory depth, you'd spend your days dumbfounded:
“Why do things fall?? Why do you return to earth when you jump?? What's up
with clouds—they don't seem to fall at all!! Why do some things fall when
in water and some things don't?? Why can birds rise by flapping their
wings, but I can't rise by flapping my arms??”
You can't live your life if you're always getting stuck on mysteries like
this. You'd get so mesmerized by the inexplicability of your porridge
falling into your bowl and bubbles rising in your water that you'd forget
to eat or drink and you'd die. That's why we *need *the illusion of
explanatory depth: most things have to feel like they make sense, even if
they don't, so that we can get on with the business of living.
And indeed, people born before the discovery of gravity understood this
whole falling business exactly as well as they needed in order to survive.
They knew that they'd fall and die if they walked off a cliff, that the
things they throw in the air will fall down on people's heads, and that
houses tip over if they aren't built properly. Maybe they thought they
understood it better than they actually did, but for their purposes, they
understood it perfectly well.
In fact, I humbly submit that, despite all our progress, the average human
today understands the things-falling-down problem only a tiny bit better
than the earliest humans did. Take me as a test case: if you asked me why
things fall down, I'd go, smugly, “Gravity!” But that's not an explanation.
I could go a little deeper: “Well, everything with mass exerts an invisible
force on other things, which pulls those things closer. More mass, more
force.” But why do things have this invisible force? How do they exert it?
Why does it make things come closer? I understand that *someone *could
probably answer those questions, but *I *cannot. To me, they're just some
arbitrary rules of the great board game of life, much like they were to all
of my ancestors.
*SMACK ME IN THE FACE AND TELL ME I KNOW NOTHING*
Okay, so an illusion of explanatory depth is extremely important to staying
alive. It does, unfortunately, have a downside: it fools you into thinking
the universe isn't full of mysteries.
This, I think, explains the curious course of our scientific discovery. You
might think that we discover things in order from *most *intuitive to *least
*intuitive. No, thanks to the illusion of explanatory depth, it often goes
the opposite way: we discover the *least *obvious things first, because
those are things that *we* *realize we don't understand*.
That would fit with our incredible ancient progress in mathematics, because
math is *not *obvious. Here's an example: could you please tell me the
volume of this figure?
<https://substack.com/redirect/a8475427-8254-4f43-8b2e-4d5b7cc08bac?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
Image
cred: Stumps
<https://substack.com/redirect/193885f7-f76e-40f2-af4a-95e35d621c0f?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
Unless you're a math whiz, I assume the answer does not spring to mind.
Maybe you get a sense of , “I think I learned how to do this in high
school, I bet I could get it if I thought for a little bit.” Or maybe, like
me, you just get a sense of despair. Either way, there's no illusion of
explanatory depth here; this problem absolutely smacks you in the face with
the realization that you don't know the answer, and it would at least take
some work to figure out. And that's exactly what you need to discover
something—to realize that you don't know it yet. Perhaps that's why the
ancient Egyptians nailed this one ~4,000 years ago
<https://substack.com/redirect/09a52770-0337-485a-b66a-afa37333a383?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
!
I'm sure that progress in math still requires intuition and insight.
(Indeed, the mathematician Henri Poincaré reports that he came up with Fuschian
groups
<https://substack.com/redirect/ff0d8033-9bef-471f-ba0b-456fd5e887bb?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>—whatever
those are—suddenly and almost magically while he was getting on a bus
<https://substack.com/redirect/fe5ea8e1-facb-4df0-9658-51e4c8bf52fb?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>.)
But math, perhaps more so than any other intellectual pursuit, emits very
strongly what we might call *ignorance signals*, signs that there's
something you don't know. Maybe it's all the numbers and symbols, the funny
shapes, the level of abstraction, the amount of stuff you have to hold in
working memory, the heaviness you feel in your head when doing mental
math—whatever it is, it seems to have helped us do a lot of good math very
early in our intellectual history.
Other subjects, however, emit fewer ignorance signals. Compare this
mathematical discovery from the second century
<https://substack.com/redirect/0e413d10-e653-4444-b0f1-a7b23a85fca7?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
:
<https://substack.com/redirect/7ca2a86d-3cfd-4db2-bb96-8fa9b155ab0c?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
With this physics discovery from 1586
<https://substack.com/redirect/b4a9e087-fae0-4334-921b-1f8f9b66be76?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
:
<https://substack.com/redirect/eb80f88e-4fc2-4bbf-9c5d-59560986c708?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
Image
cred: Theresa Knott
<https://substack.com/redirect/62a4e364-837b-4783-8b06-0f28b2b5cd48?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>.
(The sizes of the spheres represents their masses, not their volumes.)
The first one is a method
<https://substack.com/redirect/1831f557-8226-4841-b96e-047d47f9b95a?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
of evaluating polynomials, and I don't even know what it means to evaluate
a polynomial (“Hey, nice polynomial you got there”?) The second one is an
experiment showing that heavier things and lighter things fall at the same
rate, which seems like the most obvious experiment in the world. So why did
we only discover it 12 centuries later?
The answer, I believe, is that we had an illusion of explanatory depth for
weight but not for polynomials. It makes perfect intuitive sense that
heavier things should fall faster—after all, it's harder to hold them up!
Most people never encounter a situation where they have to know whether one
thing will fall faster than another; if you knock over a full glass and a
half-full glass, for instance, they'll both be empty glasses rather
quickly. Plus, some things obviously fall slowly, like feathers and flower
petals, so there's a precedent for things falling at different speeds. So
why bother tossing stuff off the Leaning Tower of Pisa?
If that didn't satisfy your curiosity and you also happened to be born
after 322 BCE, you had an excellent guide for explaining why things fall
down: Aristotle
<https://substack.com/redirect/ca8f26e7-0e63-41be-a494-05f57163171f?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>.
According to him, things fall down because the human world is made of four
elements, each with its natural place: earth at the bottom, then water,
then air, then fire. Things move in the physical world when they're forced
out of their natural order—earth in water will sink, air in water will
rise. This sounds silly to us today, but as the physicist Carlo Rovelli
explains in this terrific article
<https://substack.com/redirect/6d2965f0-6b4d-435e-9085-9f5d04c05111?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>,
Aristotle actually did a great job:
In summary, Aristotle’s physics of motion can be seen, after translation
into the language of classical physics, to yield a highly non trivial, but
correct empirical approximation to the actual physical behavior of objects
in motion in the circumscribed terrestrial domain for which the theory was
created. [...] The reason Aristotelian physics lasted so long is not
because it became dogma: it is because it is a very good theory.
So yes, Aristotle's system suggests that heavy things should fall faster
than lighter things because they have more “natural motion” toward their
rightful place. This turns out to be wrong. But it was very hard to notice
why it was wrong because Aristotle's physics mostly made sense otherwise.
There simply weren't enough ignorance signals to make it seem reasonable to
check whether heavy things actually fall faster. I mean, if you stepped
into the Pantheon
<https://substack.com/redirect/62bbcb41-c167-4f6a-84f3-da82014a7164?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
(built in the second century, a few hundred years after Aristotle) and
beheld its magnificent architecture that stayed up perfectly well—and still
does—you probably don't find yourself thinking, “We need a new system of
physics.”²
Upgrade to paid
<https://substack.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.fuxaVfvzyfWobRIKs21q-BXaER8pH2tnGHPEt9btmXc?&utm_medium=email&utm_source=subscribe-widget&utm_content=137606009>
*GO BLIND, GET HIGH, INVENT PSYCHOLOGY*
Which brings us to psychology. No offense to the mathematicians, but most
of us find people way more interesting than numbers. So why did we spend
centuries studying numbers, while we've only recently started studying
people?
Maybe it's because psychology is the domain with the deepest illusion of
explanatory depth. You open your eyes and see stuff, and although this
requires lots of complicated calculations and several anatomical miracles,
it doesn't feel mysterious at all. You hear a song and remember the lyrics
years later, and this seems totally natural. You and your spouse watch the
same movie and have different opinions about it, and the explanation seems
obvious: you're right and they're wrong. It's so easy to accept the wild
workings of the mind at face value, or to generate ad hoc explanations for
them, that you might never realize you have no idea how any of this works.
While philosophers have occasionally made these illusions deeper by
spinning up spurious theories of psychology, I bet most of our illusion of
explanatory depth for psychology comes preinstalled or is acquired quickly
through experience. The brain's greatest trick is convincing you that it's
not doing any tricks at all, blocking your conscious access to most of what
it does and then giving you a perfectly reasonable account for what's going
on behind the curtain:
Me: Hey brain, I notice that I can see stuff. How does that work?
Brain: Oh, there are things in the world, and then I peek out through my
eyes and see them.
Me: Cool, sounds good.
Overcoming this expertly-maintained illusion requires a big push, which is
perhaps why we didn't do it until a German guy stared directly into the sun.
Most histories of psychology as an experimental science begin with Gustav
Fechner
<https://substack.com/redirect/09414944-26e5-467f-9747-205f95ff433c?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
setting up a psychophysical laboratory in the middle of the 1800s. What
those histories often fail to mention is that Fechner began as a physicist,
but then he suffered a mental breakdown after going blind because *he
stared at the sun for too long*.
He was trying to study afterimages, those glowing spots you get in your
field of vision when you look at something bright and then look away. If
you do that too many times, it turns out, you fry your retinas and get
really depressed for three years
<https://substack.com/redirect/f04af892-219b-45e3-a5cf-a9c2b73a3f3b?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>.
Fechner was completely blind for a while, and then he underwent treatment
by moxibustion
<https://substack.com/redirect/b8df72b6-17fa-47b6-b41b-634a481b38b4?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>,
which is where you put a weed called mugwort on someone's skin and then set
it on fire. Besides leaving scars, this treatment somehow ruined his
digestion, and he almost starved to death before a family friend figured
out a way of preparing ham in a way that he liked; the friend said the idea
came to her in a dream.
Fechner eventually recovered, but the experience turned him weird. Maybe it
was the mugwort, which has psychedelic properties according to this
seemingly-trustworthy
website
<https://substack.com/redirect/b8b2a8a9-436f-40ce-98ac-a0740607788b?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
³, which would make sense, because when Fechner regained his sight, he
acted like someone who had been doing a lot of shrooms.⁴ His first
post-blindness project was a book about the mental life of plants. Then he
decided to invent a new religion. From the biography
<https://substack.com/redirect/42b4559e-0e59-4334-af1c-faafa06633b3?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
that appears at the beginning of the English translation of his
landmark *Elements
of Psychophysics*:
Fechner's general intent was that his book should be a new gospel. The
title means practically “a revelation of the word.” Consciousness, Fechner
argued, is in all and through all. The earth, “our mother,” is a being like
ourselves but very much more perfect than ourselves. The soul does not die,
nor can it be exorcised by the priests of materialism when all being is
conscious.
Fechner wrote seven books on the topic, but they never caught on, so he
decided he should give his new philosophy a “scientific foundation.” For
reasons not entirely clear to me now, he thought the most important thing
to do was set up a laboratory and do things like: show people two lights
that are almost equally bright and then ask them whether they can tell the
difference between the lights. I don't know if this ultimately provided
vindication for Fechner's philosophy, but he did discover
<https://substack.com/redirect/4c96d4eb-762b-4aec-ac54-9c8d4bb4e63b?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
that the “intensity of our sensation increases as the logarithm of an
increase in energy,” and thus laid down, for the first time in history, a
scientific law of psychology.
Fechner's sun-addled realization helped get people to start both a)
wondering about how the mind works, and b) believing that you could study
it empirically. He and his friends Ernst Weber
<https://substack.com/redirect/24da792e-d864-4fcc-8487-15037734c7b7?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
and Wilhelm Wundt
<https://substack.com/redirect/e3c3ab96-7c1f-4d9a-9110-36d8a6746bd2?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
turned the University of Leipzig into the hot place to be for psychology,
where they trained most of the prominent psychologists of that generation,
who in turn trained most of the prominent psychologists of the *next
*generation.
A good chunk of experimental psychologists working today are descendants of
Fechner and his friends, including me.⁵
Which is to say: the field of experimental psychology exists today at least
in part because a German guy stared at the sun for too long.
What Fechner needed, of course, was not to get his eyeballs cooked, but to
get his illusion of explanatory depth dispelled. Virtually every human who
had ever existed before him felt content enough with their knowledge of the
mind to not bother learning anything more about it. A few people had been
curious enough to at least advance a few theories, but they didn't think it
was necessary to gather data. (Immanuel Kant, in fact, had written
<https://substack.com/redirect/0c4719ea-d498-4f38-9bff-43ceace8679a?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
only 75 years before that gathering data was hopeless; we would never learn
much more about psychology than we already knew.) We could not make
progress in psychology until we understood how little we actually
understood, and perhaps going blind from staring at the sun, lying in bed
for three years, inhaling some burning mugwort, and inventing a new
religion makes you realize there are a lot of questions we haven't answered
yet.
Fechner's intellectual descendants set about answering those questions,
many of which could have been answered long before, but nobody had thought
to do so. One of the most influential studies in developmental psychology,
for example, is about whether babies can recognize faces
<https://substack.com/redirect/066f242a-4843-4e38-902a-5871422d869c?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>;
you can replicate it with some cardboard, a mirror, and a baby. Actually,
while you've got the baby handy, you can also replicate the Little Albert
experiment
<https://substack.com/redirect/082d4c67-c312-4367-850a-b0f8bce8bcad?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>—an
early proof of concept that humans can be classically conditioned—by
putting on a Santa Claus mask and banging some pots and pans to scare the
baby, but please don't do this. The original study on “learned helplessness
<https://substack.com/redirect/a5fa023d-5ca7-4aed-89f6-192829f32de4?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>”
used an electrified floor to shock dogs; you could conceivably replicate it
with a more ancient way of torturing a dog, but please don't do this
either. We didn't need modern technology or advanced mathematics to study
these topics—in fact, someone living hundreds or even thousands of years
ago probably could have done a half-decent version of almost every
study on this
random list
<https://substack.com/redirect/eaf86554-a64c-4aa8-9ff6-34d464c587d3?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
of famous psychology experiments. The answers were simply waiting for us to
go looking for them.
*PLEASE FEED ME 11 SLICES OF BREAD PER DAY*
It's easy to look back on the history of our discoveries and believe that
we've moved from an era of mysteries to an era of certainties. No: we've
always lived in an era of mysteries, and we've always lived in an era of
undue certainties. We know more than our ancestors did, yes, but far, far
less than we *think *we know.
So where are our illusions of explanatory depth still the thickest? One is
in psychology, where I've argued
<https://substack.com/redirect/045df2b0-74e4-4069-b614-4ace308b1f26?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
that we're stuck doing things in ways that used to work but don't anymore,
or in ways that never worked at all. Another is probably in dentistry
<https://substack.com/redirect/d3387110-25a0-4877-a012-46c362135a27?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>,
where we have pretty bad evidence for almost everything. I'd wager that
“dark matter” and “dark energy” are going to end up looking silly, but what
do I know.
The biggest illusions of explanatory depth might be in nutrition and weight
loss, where lots of people believe things very strongly for no good reason.
For instance, I grew up staring at this image on the back of my cereal box:
<https://substack.com/redirect/84541a6b-6be7-4ce1-a8cf-422bf0a0ea35?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
That's right: the government said I should eat *eleven slices of bread per
day*.⁶
Gulping down half a loaf of Wonderbread every day sounds crazy to many
people now, but those people also believe many things that will probably
sound crazy sometime soon. Eat a lot of fat/no don't! Eat a lot of meat/no
don't! Eat only at certain times/no, eat whenever you want! I was once at a
dinner where a professor politely refused a plate of potatoes because she
was “trying to lose weight,” and I had to giggle because I had just read
<https://substack.com/redirect/cccf2caa-edec-4f9b-a38c-900da8d1a495?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
about a bunch of people who lost weight eating *only *potatoes. At least
there are few things we all agree on—I mean, nobody thinks you can lose
weight by eating croissants all day! (Oh, wait
<https://substack.com/redirect/6313b878-120d-4722-8bb4-5097ba29d644?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
.)⁷
Look: we don't really know what's going on here, which is fine. What's not
fine is *believing *that we know what's going on, because then we'll never
do what it takes to actually figure it out. The first step in solving the
mysteries is believing in the mysteries
<https://substack.com/redirect/0d59e1ac-652e-4432-aaf1-b38373f866cd?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
.
*WAKE UP AND SMELL THE MUGWORT*
It's hard to overcome your illusions of explanatory depth, just like it's
hard to hold your breath for a long time—our urge to make sense of things
and our urge to breathe are both there for good reason, and our brains
don't trust us to turn those urges off at will. It takes practice.
Fortunately, we have lots of role models. And now we can better understand
what made them so successful: their ability to understand how little they
understood. Francesco Redi, the man behind the rotting meat
experiment, describes
it well
<https://substack.com/redirect/fbbcaf96-280f-4105-b970-c966ecb3b464?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
:
Every day I am becoming more and more certain in my decision of not
believing anything about nature except what I have seen with my own eyes
and what has been confirmed by experiments repeated and repeated again; for
I have seen very clearly that it is most difficult to trace the truth since
it is so often disguised by untruth, and that many ancient and contemporary
authors resemble the sheep about which our divine poet [Dante] sings.
Unfortunately, the illusion of explanatory depth takes many shapes. Our
ancestors believed that the Bible or Aristotle had everything figured out.
We got over that, but now some people believe that science itself has
everything figured out. We've done all the easy stuff, this line of
thinking goes, and so it's only the hardest discoveries that remain.
Oh, how I hate this idea!
<https://substack.com/redirect/509e4755-f57e-4469-9bae-9ccba6cf0c02?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
It's just the illusion of explanatory depth dressed in a lab coat. And this
incarnation is the worst of all. If you think you know how a toilet works
when you actually don't, whatever—you still know enough to go #2 without
embarrassing yourself. But if you think you know how science works when you
actually don't, you're sunk—you literally can't do it if you think it's
impossible.
Somewhere out there is our modern-day version of the rotting meat
experiment. There are ideas that are simply too obvious to see, obscured by
our theories that seem to make more sense than they actually do. Wherever
our convictions are strong and our evidence is weak, there is a
breakthrough waiting to happen. And then hundreds of years from now, our
descendants will look back and say, “I can't believe it took them so long!”
So wake up and smell the mugwort! It's a new day and the sun is shining—*time
to go stare directly at it!*
Experimental History lives to dispel illusions of explanatory depth, and
can do so only with your support
Upgrade to paid
<https://substack.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.fuxaVfvzyfWobRIKs21q-BXaER8pH2tnGHPEt9btmXc?&utm_medium=email&utm_source=subscribe-widget-preamble&utm_content=137606009>
1
I accept this explanation in the same way I begrudgingly accept the long
list of arbitrary rules that precedes every new, complicated board game.
“Settlements and cities may only be placed at the corner of the terrain
hex—never along the edges.” Okay, fine. “When placing a greenery tile, you
increase the oxygen level, if possible, and also your TR. If you can’t
raise the oxygen level you don’t get the increase in TR either.” Got it.
“Water molecules can randomly gain enough energy to evaporate.” Sure,
whatever!
2
Thomas Kuhn writes
<https://substack.com/redirect/2d0416de-431a-47c2-ad87-8d2d390c8950?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
beautifully about this. He's trying to figure out why people had followed
Aristotle's system of physics for so long when it seems so dumb, and then
finally it clicks for him that Aristotle's system makes a lot of sense from
the *inside*:
I was sitting at my desk with the text of Aristotle's *Physics* open in
front of me and with a four-colored pencil in my hand. Looking up, I gazed
abstractedly out the window of my room—the visual image is one I still
retain. Suddenly the fragments in my head sorted themselves out in a new
way, and fell into place together. My jaw dropped, for all at once
Aristotle seemed a very good physicist indeed, but of a sort I'd never
dreamed possible. Now I could understand why he had said what he'd said,
and what his authority had been. Statements that had previously seemed
egregious mistakes, now seemed at worst near misses within a powerful and
generally successful tradition.
3
It also, apparently, cures farts.
4
Drugs show up curiously often
<https://substack.com/redirect/05d220e5-ab85-4f79-8ce2-e3d43e1fc775?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
in the history of scientific breakthroughs.
5
Fechner
<https://substack.com/redirect/09414944-26e5-467f-9747-205f95ff433c?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
-> Lotze
<https://substack.com/redirect/d8e0b4ab-00a7-4933-91e4-e1958c216398?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
-> Stumpf
<https://substack.com/redirect/178b4688-03af-49c5-96a3-0231e4474e3c?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
-> Langfield
<https://substack.com/redirect/bf9b2f84-f00f-4bb5-b877-ada0f41bdafb?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
-> Allport
<https://substack.com/redirect/5748c233-b293-4beb-be81-9d181c7adad0?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
-> Bruner
<https://substack.com/redirect/2a6ff206-22ac-48be-ab45-9c3bdb879707?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
-> Jones
<https://substack.com/redirect/64575fbc-7847-4e36-9b32-8efab28f5711?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
-> Gilbert
<https://substack.com/redirect/0ea4996e-fcaf-4441-b035-b5b9fcfc0181?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
-> me
6
This was, in fact, merely a passing phase in federal dietary guidelines
<https://substack.com/redirect/745d1697-d6de-4b3b-a124-35593b4a90be?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>,
which began by specifying five
<https://substack.com/redirect/bfd18b45-205f-4c70-918b-81b8bcac7eba?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
food groups, which then became seven food groups, then four, then six, then
up to five, then back to four, then six again, then five with seven
subgroups, and most recently six with 10 subgroups.
7
“All you have to do is burn more calories than you consume,” is perhaps the
most smugly dispensed piece of dieting advice, but it's true only in the
most useless sense, like “all you have to do to make your car run is to fix
your car.” For more, see these three
<https://substack.com/redirect/c7e3a9e4-0acb-44bf-8903-d858e583f869?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
great
<https://substack.com/redirect/b01592c2-5892-49a9-bade-3e8205d94ce1?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
posts
<https://substack.com/redirect/0fd4d725-8d50-46d1-b0f9-da52f9f76e05?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
from fellow bloggers ExFatLoss and SMTM.
*Thanks for reading! If you like Experimental History, the best way to
support it is to take out a paid subscription. That also gives you access
to every post, like last week’s I sent Paul Bloom an email
<https://substack.com/redirect/885d2662-84b2-4a4a-a6d5-cb36e1c5c5ab?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>
and my crash course in negotiation
<https://substack.com/redirect/f3ee601f-08dc-48db-96b4-b8f3a09b2b20?j=eyJ1IjoiMWgyeW9xIn0.G28iMBQa64LkLY6j_SGl9AzF0Jkf1chpPVPp2b3P03c>.*
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--
Oct 30: https://netdevconf.info/0x17/news/the-maestro-and-the-music-bof.html
Dave Täht CSO, LibreQos
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