even more

That Earth is hot—maybe half from radioactive decay and half from leftover heat from when the planet formed—and heat is atoms jiggling around and the faster they jiggle the more often electrons absorb some kinetic energy and spit it out...

what the stuff we like says about us

I recently noticed that when I buy beer, I sometimes get Belgian Trappist Quintupel. And I sometimes get American Fermented Value Product. But never Blue Moon or Sam Adams or Peroni or Becks or Pilsner Urquell. Why? I guess I...

insensitivity to evolution and engineering?

We all have our peculiarities. One of mine is an obsession with tunnel man. A few years ago, a 31-year-old man inherited some land and decided—for no particular reason—to dig a tunnel. He found that he liked tunneling so he...

politics more than science

To get a crude answer to this question, we took 5000 questions from Manifold markets that were resolved after GPT-4’s current knowledge cutoff of Jan 1, 2022. We gave the text of each of them to GPT-4, along with these...

thoughts on tubes

Colonoscopies are the first-line method for preventing colorectal cancer in America —and almost nowhere else. But do they work? We finally have a comprehensive trial, but it’s left gastroenterologists with more questions than answers.

Less automation and less agony

Reading a book one night, you decide to turn on the lights. And suddenly it’s obvious. Hauling your body across the room just to flip a switch is absurd. So you decide to get smart lights. Two hours later, your...

why bad and why so much promote

grug try to not yell about bads in science news too much because why make same yells over and over? and grug have no new learns, just feel people maybe sometimes not use old learns and grug family often plead...

16 queries and 6 language models

Language models, whatever. Maybe they can write code or summarize text or regurgitate copyrighted stuff. But… can you take ducks home from the park? If you ask models how to do that, they often refuse to tell you. So I...

On game trees and reasonableness

I don’t sense that I’m viewed as particularly skilled at human interaction. Still, some poor fools sometimes ask me for advice, and I find myself repeating the same little speech. For context, in life as a human you will often...

Are fancy fragile solutions overrated?

I have an almost moral dislike for the four-wheeled suitcase. Bear with me here. Before 1972, luggage had no wheels. Then, Bernard Sadow patented this design with four small wheels and a strap: By all accounts, this design wasn’t great...

Maybe they're bad

I wouldn't suggest literally dismantling Harvard. (Caution is advised before destroying your most successful institutions.) My real thesis is more like: College admissions are (1) highly competitive and (2) consequential. Maybe those alone are bad? Maybe we should think about...

An unhinged polemic

Say that when people apply for their first driver's license, 1% get Executive Platinum licenses. For life, they get free use of toll roads and can drive 20% over the speed limit. People argue—fiercely argue—if these should be awarded based...

tires + battery + heavy

Claim: Per kilometer driven down the road, electric cars create more particulate air pollution than gas cars. That’s ignoring all other emissions and anything that happens at a power plant or during manufacturing.

the territory under dispute

On July 14, two different arms of the WHO released their findings on aspartame. One designated it “possibly carcinogenic to humans”, while the other concluded that “dietary exposure to aspartame does not pose a health concern”. The FDA took the...

greater lesson unclear

1. There’s an early scene where Lawrence leaves a band of Bedouin people to go look for a man who was lost in the desert. He does this despite fierce warnings that after the sun rose, he would almost certainly...

A tale of bad choices

Interested in how to be a big dumb idiot and over-complicate things and waste time and money and endure tons of stress and some real physical pain all by thinking that you’re cleverer than you actually are? (No?) Looking back,...

Building a safe AI ≠ preventing all unsafe AI

In The Vulnerable World Hypothesis, Nick Bostrom imagines we found a technological "black ball"—say a way to make a nuclear weapon with just some glass, some metal, and a battery. He concludes that society in our current "semi-archic default condition"—could...

They'd have to be messing with us.

Some suggest there might be alien aircraft on Earth now. The argument goes something like this: A priori, there’s no reason there shouldn’t be alien aircraft. Earth is 4.54 billion years old, but the universe is 13.7 billion years old,...

There's a little accountant named Jim that lives in my head

Nobody gets everything they want in life. That's OK. If everyone was a sportscaster-rockstar-scientist-model-author-influencer-billionaire, we still wouldn't be happy because everyone else would be too busy to be impressed. But still, it's a little sad when you don't at least...

You lose glycogen before fat. Glycogen is heavy.

We lose weight when we burn more calories than we eat. But how much weight do you lose for a given caloric deficit? This isn’t complicated. But it’s not trivial either, because the body has two forms of energy reserves:...

AI will make some old-school philosophical thought experiments seem much more relevant

The year is 2029 and you’ve finally done it. You’ve written the first AI program that is so good—so damn good—that no one can deny that it thinks and has subjective experiences. Surprisingly, the world doesn’t end. Everything seems fine....

Or: Why you like burrritos

Here's something weird. At least, I think it's weird. The hard problem of consciousness is why it feels like something to be alive. Physics does a good job of explaining everything that happens in terms of fields and atoms and...

We probably could have

The ancient Romans were never great at building ships and never tried to explore the Atlantic. The basic reason seems to be—why bother? The open ocean has no resources and is a vast plane of death. But imagine that in...

The world is running out of khakis

I originally wrote this as part of a much longer post on LLM scaling laws and possible barriers/trajectories for progress. The idea was to provide the minimal background necessary to understand all that stuff. But in retrospect, many people probably...

Is it helpful for things to work this way?

By the early 1950s, it was known thanks to people like Miescher, Levene, and Chargaff that genes were carried by long polymers in the cell nucleus. It was also known that those polymers had a sugar-phosphate backbone and were composed...

Sometimes weirdness does pay

I’ve always wanted to believe that you could get enormous advantage in life just by willing to be weirder than other people. And when I read about people like Amos Tversky (leave movies early! go jogging in your underwear! throw...

Report back on how it goes

1. Is the existence of the Guinness Book of World Records a positive or a negative for humanity on net? 2. Bragging about material possessions is low-status in much of the West, forcing people to jostle through subtle wealth cues...

Some obvious-in-retrospect thoughts

When you shift from being managed to also sometimes managing others, you have a predictable shift in perspective and a lot of obvious-in-retrospect insights. In the spirit of “saying obvious things is good” here are a few. Be honest Since...

ice, chess, tractors, railroads, swords, sword fighting, mass production, pre-fab homes, photography, Segways, scissor doors, pornography, calculators

How will large language models (LLMs) change the world? No one knows. With such uncertainty, a good exercise is to look for historical analogies—to think about other technologies and ask what would happen if LLMs played out the same way....

subterfuge, berries, Bayes, billboards, stop signs

Some time ago, I was driving somewhere with a friend and I claimed that someone was operating with subterfuge. There was an odd silence, after which my friend quietly asked, 'What was that?' Something was wrong. Was she offended? I...

More of them

That when cyanobacteria arose 2 billion years ago and filled the atmosphere with oxygen which killed off most species and removed methane from the air so temperatures crashed and the entire planet was encased in ice, this didn’t quite extinguish...

If you get a CT scan (or an X-ray or a nuclear medicine scan) is it worth worrying about the radiation?

You're probably aware that if you get a CT scan, that exposes you to a fair of radiation. But I've always wondered—how much should I care about that? So here's an attempt at a rough estimate. As always, I think...

Unless you're careful, conditional prediction markets have all the same problems as observational studies.

We all want to make good decisions. But it’s hard because we aren’t sure what’s going to happen. Like, say you want to know if CO₂ emissions will go up in 10 years. One of our best ideas is to...

Wouldn't it be quite a coincidence for this to be the moment public opinion got it right?

It's tempting for the moderate to strut. Isn't it enlightened to see truth in both sides? To calmly rise above the squabbling? But there's a strong argument against moderation: Public opinion has been evolving for hundreds of years. Many things...

What if you and Monty decide to cheat?

The Monty Hall problem has now been a pox on humanity for two generations, diverting perfectly good brains away from productive uses. Hoping to exacerbate this problem, some time ago I announced a new and more pernicious variant: What if...

It's just adding a variable to a regression.

I’ve always seen cathedrals as presenting a kind of implicit argument to atheists. Something like: God must exist, because otherwise it would have been insane for people to build this:

After decades of research, we now have a huge body of studies and meta-reviews to summarize it. What do they say?

I was wrong about gratitude. I thought it was a guaranteed way to become happier and went around proclaiming we should be thankful because: "Hokey, unfashionable techniques like practicing gratitude turn out to have strong scientific evidence behind them." Sorry...

Tracking my cognitive performance for a year

A year ago, I started playing puzzle storm. This is a short game where you try to rapidly solve as many chess puzzles as you can in a few minutes.

On asking people to consider stuff that sounds crazy

It’s frustrating to propose an idea and have people dismiss it just because it’s weird. You’ve surely seen people ridicule ideas like worrying about wild animal suffering or computers becoming sentient or comets crashing into the planet. I’ve encountered some...

Noise, Indian cheetahs, and Fighting Joe

I think the bluetooth speaker is a pox on our civilization. Random noise makes it hard for me to concentrate. I tried the obvious thing and created a passive-aggressive mathematical model, but that unexpectedly failed to make the problem go...

That's what she said, a rabbi resolves a dispute, and six categories in the Philogelos

I've noticed a disturbing phenomenon: Many people who only recently watched the US version of The Office seem to think that Michael Scott invented That's what she said. Of course, the actual joke was supposed to be a ghoulish delight...

A potent anti-humor technology

No soap, radio is a sort of prank where you tell a "joke" with a meaningless punchline. The hope is that your victim will laugh despite not understanding it, thereby enabling you to ridicule them. Apparently, this works best if...

People don't seem to try very hard to make themselves happier. Why not?

Everyone I know is scheming for the future. They've got big goals and get up every day and work like mad to try to achieve them. I've always found something odd about that: Despite all this effort, people don't seem...

Why not tax businesses for the misdeeds of their customers?

Say you're a dictator fed up with your citizens' littering. What can you do? Option 1: Make littering illegal. This is obvious, but it's clearly no magic bullet since everyone's already done it and yet littering hasn't perished from the...

Sixteen observations on Albania, Montenegro, and Macedonia

People say the cafes in Albania are great. This is true. They are similar to Italy but with environments that are more laid-back and… better? Standards are remarkably high even at roadside cafes next to petrol stations.

Nine observations about what happens when you eat only potatoes

You've probably heard about the potato diet. If not, here it is: 1. Eat potatoes. 2. As many as you want. 3. Oil and salt are OK. 4. Don't eat other stuff. I thought this sounded delightfully absurd so I...

Gorillas, penguins, noise location, air quality, and a conversational pattern that needs a name

Has a gorilla killed a human? Gorillas, despite their immense size and strength, are not aggressive. They are vegetarian except for eating insects and occasionally small rodents. In 1986, a five-year-old child fell into the gorilla pit in the Channel...

What are letters of marque and reprisal, and who is on the US's list of Block Persons?

Article I, Section 8, Clause 11 of the US Constitution reads: "The Congress shall have Power to declare War, grant Letters of Marque and Reprisal, and make Rules concerning Captures on Land and Water;" What are these Letters of Marque...

A debate about humanity's ultimate adversary

Evil. The problem is people doing bad things that they know are bad. Everyone just needs to stop demanding bribes and littering and murdering each other. Moral confusion. No, in reality, most people try to do the right thing most...

The Wirecutter's review of the IKEA air purifier is a mishmash of scientific errors, shoddy testing, and self-contradictory logic.

IKEA has recently made some moves into the air purifier space. The Wirecutter is not impressed. They allow that this purifier is inexpensive and pretty. But still, it's terrible and you should instead buy a different purifier that totally coincidentally...

Investigating the (aspartame → phenylalanine → dopamine) theory

"Very ambitious and successful and competitive and rich person loves Diet Coke" has been in the news recently, and friend of the blog Aaron Bergman proposes a theory as to why. Spelled out in more detail, it goes like this:...

Commonsense morality is an OK-ish utilitarianism

1. In college, I had a friend who was into debate competitions. One weekend, the debate club funded him to go to a nearby city for a tournament. When I asked him how it went, he said: Oh, I didn’t...

A mathematical model of who turns on their bluetooth speaker at the beach.

Say you're at a park or a beach. How many people will have bluetooth speakers on? It seems to me there are three types of people: The main characters always turn on their speakers regardless of what anyone else is...

More on teaching, hot in-laws, medical diagnostics, and some questions thrown into the void

Here's a collection of a few disconnected follow-ups plus some questions thrown into the void. Contra me on teaching. A couple of months back, I took issue with Parrhesia's proposal to make final exams worth 100% of the final grade,...

Why did the oracle of Delphi go into a trance state? Does it have anything to do with ethylene?

In ancient Greece, the Oracle of Delphi operated out of the Temple of Apollo. This temple was destroyed in AD 390 by the Roman emperor Theodosius I in the name of Christianity. Still, it's a real place and the ruins...

Who can deny that many store-bought tomatoes have a certain similarité to acidic balls of cardboard?

Ethylene is the source of a lot of confusion, particularly when it comes to tomatoes. In *Tomatoland*, Barry Estabrook writes: "An industrial Florida tomato is harvested when it is still hard and green and then taken to a packinghouse, where...

Reflections on a phenomena that's unique to culture-war topics

There's a certain phenomenon I often wonder about, one that only seems to occur with culture war topics. I usually try to avoid culture war, but it's impossible to discuss this phenomenon without an example and I don't see the...

The puzzling movement reduce diagnostic tests because of harmful downstream treatments

1. Say we’re detectives. We’re getting a drink and have the following conversation: Me: Ah, this case is killing me. You: Then why don’t you go talk to Big Eddie? Me: Nah—that would do more harm than good. You: How’s...

Nations could build nuclear warheads much more powerful than they have now. But they have no interest in doing so. Why is that?

The Little Boy bomb detonated over Hiroshima in 1945 was a fission weapon where a critical mass of uranium-235 created a chain reaction of atoms splitting into lighter atoms, releasing energy and neutrons. While such weapons are very destructive, they...

Imagine you’re flying a plane full of babies. Initially, they’re all sleeping peacefully. But if one wakes up, they’ll start crying. That will eventually wake up some of the neighbors who will also start crying, and soon your plane will...

Ethylene gas, how it works, and how to manipulate it in your kitchen

Amos answered Amaziah, "No prophet am I, not any prophetic symbol, but a shepherd am I, who used to prick the sycamore fruit that it might duly ripen for the market." —Amos 7:14 (translated by Samuel Cox) While I'd like to...

Dark patterns in social behavior

I was working in a cafe when a woman sat nearby and asked me if there was anywhere in the neighborhood she could see some art. Hoping to get back to work, I made a couple of suggestions. She asked...

Things I suggest you write about

After a mutant spider bite, you take Fluffer to a dog park and realize he is bark-gossiping about you with the other dogs. What is he saying?

Do we really know what the future needs?

The argument for long-term thinking goes something like this: ● There are X people alive today. ● In the future, there will be Y≫X people alive. ● All people have equal moral weight. ● Therefore the state of the world...

We should encourage more public disagreement.

Probably most social norms are like that---even if we disagree with them, they're too entrenched to change. That's why it's important to watch for critical points where norms could go either way. Here's one such case: Say someone wrote something....

Why do you disagree with your parents about the importance of looks?

When you look for someone to marry, you’ll care about many things: Are they smart? Healthy? Kind? Funny? Educated? Employed? And are they, like, wicked hot?

Here are some things that I hated as a student. At the time, I thought my teachers didn't understand or care how terrible they were.

In a recent post, Parrhesia suggested that course grades should be 100% determined by performance on a final exam—an exam that could be taken repeatedly, with the last attempt being the course grade. (See also the discussion at r/slatestarcodex.) The...

History suggests that poor countries have the same growth as rich countries on average, just with much higher variance.

I used to have a mental model that economic growth was about: 1. Figuring out clever ways to do stuff. 2. Doing it. Rich countries are at the technological frontier, so they have to do both of these things at...

Meanwhile, in the multiverse...

In your particular branch of spacetime, you may see things like this:

How much nitrogen dioxide do stoves make and how much does it hurt you?

Many recent articles have raised the idea that gas stoves are harmful to health:

A review of the thought experiments in Reasons and Persons by Derek Parfit (part three)

You want to go to Mars. There’s a machine that will scan and destroy all the matter in your body, send the locations of every atom to Mars, and then recreate it. You worry: Does this transport you, or does...

Five proposed rules to make sure you're using analogies for good

To fix the analogy, you'd need some bizarre scenario where during the party America had lots of fun and created lots of dirty dishes but also, like, discovered new partying methodology and new ways to use dishes so they are...

An analogy between coat racks, desire paths, arguing, vacuuming, reading, social media, drinking, vacations, and colonoscopies.

You learn a lot about people from their bedrooms. Some have TVs or books or laptops. Some have blackout curtains or stuffed animals or bottles of pills. But, vast as human experience is, one thing is consistent: Everyone has once-worn...

Why does evolution do what it does? And if you're a sentient being created by it, what should you think about that?

Here are two things that seem to be true:

When does talking about a plan ruin it? Marriage, CO2, religion, self-promotion, edgelords, and Chinese medicine.

You're in love. The two of you want to share the rest of your lives. So, being good game theorists, you have a romantic dinner and plan how to align your interests for mutually beneficial optimal strategic behavior. Your goals...

A review of the thought experiments in Reasons and Persons by Derek Parfit (part one)

You live with a group of utterly rational and self-interested people on an island, gathering coconuts to survive. Tired of working so hard, Alice builds a machine and implants it in her brain. This machine leaves her rational except when...

We could be a lot better at taking care of ourselves.

Here are some things I'd like to know about how to live my life: 1. If I eat Brussels sprouts for dinner tonight instead of pizza, how much longer do I live (in expectation, in minutes)? 2. What should I...

What's the history of attempts to abolish the death penalty in the U.S.? And what did people think about them at the time?

Early America inherited much of Britain’s bloodthirsty but arbitrary approach to the death penalty, with theoretical penalties for things like theft and rebellious children that were rarely carried out. However, executions did happen for crimes short of murder: Death was...

30 underrated reasons to be thankful, starting with the fact that atomic bombs don't ignite the atmosphere

That our atmosphere has low enough pressure and levels of deuterium that nuclear fission in air doesn’t cause hydrogen atoms to fuse into helium, meaning that the first nuclear bomb test in 1945 didn’t in fact ignite the atmosphere and...

How did France ban the death penalty? And what did people think about it at the time?

Capital punishment was debated during the French revolution (1789-1799). Due to the influence of Beccaria and Voltaire, the discussion was similar to how the death penalty is discussed today. Robespierre said “The state’s execution of the death penalty is legalized...

How did the U.K. ban the death penalty? And what did people think about it at the time?

When Beccaria wrote On Crimes and Punishments in 1764, there were around 150 crimes punishable in Britain by death. This “bloody code” included crimes as small as the theft of some items worth 1 shilling. For context, a skilled worker...

How did Germany ban the death penalty? And what did people think about it at the time?

Germany came close to banning the death penalty several times in its early history: In the 1848 revolution, the new constitution almost completely banned it, but this was immediately overturned by the conservative restoration. When Germany unified in 1870-1871 it...

What does abolition of the death penalty teach us about who is in change?

Who is really in charge? In democracies, policies are correlated with public opinion, but why? The obvious explanation is that people choose representatives, and those representatives give them what they want. But maybe the causal arrow points in the other...

Many people see a homelessness crisis, but what does the data say? We examine different locations, rates of change, types of homelessness, and mental health and substance abuse issues.

Is the US in the midst of a homelessness crisis? Many people think so, but that's largely based on based on anecdotes. What does the data say? At a glance, this doesn't look very crisisy. Since 2015, things have gone...

Why did a huge alcohol RCT get cancelled? A strange story of science, academia, bureaucratic maneuvering, ambition, politics, capitalism, the deep state, secret emails, and slippery ethical slopes.

What does drinking do to your health? We can say two things with confidence: 1. Drinking is associated with lots of health problems. 2. Heavy drinking is bad for you. Here's a graph of some associations. Someone who averages 10...

If culture war is intractable, what should we do instead?

The Guadalcanal campaign was the first major offensive operation by the Allies in the Pacific theater of World War 2. This nightmarish battle ran for six months and—while an Allied victory—involved losses so high the US Navy refused to release...

How polarized are we? An overview of what people of different political parties, education levels, races, and political engagement think about politics.

We’re here on Earth for such a short time. So, I often wonder—what do people spend their days thinking about? Judging from the ever-increasing amount of screaming everywhere, the answer would seem to be politics. But is that right? What...

A review of correlations between human performance on physical and mental tasks, plus a description of how factor analysis is like a cigar

Is there a general factor of intelligence?

What happens if you cut your brain in half?

What happens if you cut your cortex in half? When this was first tried on animals, the answer seemed to be not much. But starting in the late 1950s, a series of experiments found that very weird things happen under...

Have a consistent ruleset. Titles are a black art. Have empathy for the brain’s parser. It’s impossible to follow all the conventions. Write a thesis statement even if you hate it

Why you shouldn't torture yourself when training to run.

I used to think the people I saw running were insane. They were confused about life. Whatever the benefits of running, nothing could justify that much suffering. Runners were cut from a different cloth. They had a strength of will...

Why do you have to fill out an ethnicity form to get a job in the US? What happens if you refuse?

If you ever joined a large organization in the US, you filled out an ethnicity form. Here’s a typical one:

Explains through a model of selling coconuts while value added taxes distort the economy less than sales taxes.

It turns out that sales tax has a huge, gigantic, terrible flaw: It punishes specialized businesses. A value added tax (VAT) has no such problems.

There's many suggested policies to address police violence. What do we know about if they actually work?

You can’t measure police bias using simple population ratios. A better idea is to check if police behave differently when it’s dark, but this doesn’t give any firm conclusions either. What else can we do?

The ethical theory of Utilitarianism applies to many situations, but runs into problems when choices might create new beings.

Cedric and Bertrand want to see a movie. Bertrand wants to see Muscled Duded Blow Stuff Up. Cedric wants to see Quiet Remembrances: Time as Allegory. There’s also Middlebrow Space Fantasy. They are rational but not selfish - they care...

Why trying to measure police violence though ratios is totally and utterly meaningless.

Watching people discuss police bias statistics, I despair. Some claim simple calculations prove police bias, some claim the opposite. Who is right?

What do we know about how to communicate effectively and find the truth?

Talking about sugar Nick and Maria want to talk about sugar. Does it reduce lifespan? They disagree, but are honest and principled. They want to find the truth and agree on it. How should they talk? Take turns? Try hard...

Explains comparative advantage through trades of coconuts and bananas. Also, why it might be smart to blow up your island.

Economists say free trade is good because of “comparative advantage”. But what is comparative advantage? Why is it good? This is sometimes considered an arcane part of economics. (Wikipedia defines it using “autarky”.) But it’s really a very simple idea....

Explores some natural experiments that try to measure police violence.

Measuring police bias using simple ratios doesn’t work. You can never cleanly separate the impact of race from other associated factors.

If we only believe in ethics because of evolution, does that mean ethics are a lie?

Some people claim ethics aren’t practical. Others make a grim philosophical argument:

examines claims that the big five personality traits is more scientifically valid than the myers briggs personality indicator

The Myers-Briggs Personality Indicator (MBTI) gets a lot of scorn. It would seem that the the MBTI is nonsense, but the Big Five is a real, scientifically valid test. To be sure, there's nothing wrong with the Big Five. But...

Designs for a quieter, more energy efficient purifier, and data proving it really works.

I love box-fan based air purifiers. They are cheap, trivial to build, and people around the world have done experiments to show they actually work.

Some situations where formal ethics are really needed for practical problems in real life.

Here’s a “low-brow” take on ethics that’s worth taking seriously:

Why it's basically impossible to determine fairness from observational data.

We want to know if things are fair. Do some groups of people tend to get a raw deal in company hiring or university admissions or court sentences?

Why the air you breathe matters, and what to do about it.

What do you worry about more: Getting exercise, eating vegetables, or the air you breathe? While most things that clearly improve health are well known, one is insanely underrated: Fixing your air. I suspect this is often the most effective...

Why did the Asian flush evolve? What does this say about alcoholism? What does this have to do with Odysseus?

Say you’re an evil scientist. One day at work you discover a protein that crosses the blood-brain barrier and causes crippling migraine headaches if someone’s attention drifts while driving. Despite being evil, you’re a loving parent with a kid learning...

People with the same big five personality types tend to be more happy, successful, intelligent, creative, and popular. Why aren't there more tradeoffs?

I don't know if you like parties. I don't know if you're organized or punctual. But I bet you don't like rotting smells or long swims in freezing water. That is to say: People are different, but only in certain...

How the immune system's memory cells are like the Russian strategy for resisting Napoleon's invasion.

In June of 1812 Napoleon assembled the largest European army in history and invaded Russia. After months of bloody fighting, the French finally arrived in Moscow in September, surprised to find the city mostly abandoned. That night, remaining Russians set...

You can make a DIY air purifier in 30s. To test if it works, I generated smoke, and measured how well it removes tiny particles.

Bad air is bad for you. The air purifier market, though, is a mess. Every purifier uses incompatible proprietary filters, presumably to lock you into buying replacements. How do we know these actually work? Few seem to publish lab tests....

Common arguments for universal basic income are about liberty or automation of jobs. The "real" argument is much more mundane.

Universal basic income (UBI) is an odd duck. Proponents range from futurists to libertarians to social democrats. Why this weird range of people?

Some claim that more feminist countries have fewer women in STEM. Others say this is nonsense. Who is right?

The gender-equality paradox is the (disputed) idea that countries with more gender equality have fewer women in STEM careers. While there’s lots of debate in the scientific literature about the causal implications of this paradox, there’s no agreement about a...

It's this simple: Do you want what's behind one door or the other nine?

Here’s an Obvious Problem: There are 10 doors. A car is behind a random door, goats behind the others. Do you want what’s behind door 1, or what’s behind all the other doors? That’s easy, right? Well, how about the...

Why it's better not to use an ultrasonic humidifier

Let me state two things upfront: It is possible to use ultrasonic humidifiers safely. Regardless of how they’re used, we don’t know for sure that ultrasonic humidifiers are dangerous. Absolutely true! However, as typically used, ultrasonic humidifiers might cause health...

If you can switch the order of two numbers, you can convert temperatures.

This is a new way to convert temperatures between Celsius and Fahrenheit. It’s not the most accurate method, but it’s surely the easiest.

How much do statins extend lifespan? An analysis based on a meta-analysis of six peer-reviewed papers.

It’s hard to say how much running increases lifespan. To test it, you should take thousands of people, tell half to run, and then follow everyone for years while making sure they follow their instructions. That’s not easy, and even...

Rich countries are not monolithic. However, outside the US and a few microstates, they vary in a limited range.

With abortion in flux in the US, I realized I didn’t have a clear picture of how things looked in the rest of the rich world. When I searched, I found lots of maps, like the following from Politico and...

What heritability really is: A fluid statistic that changes whenever society changes.

All psychological traits are heritable. This is the best replicated finding in all of behavioral genetics. Some recent numbers include: Religiosity: 44% Schizophrenia: 79% Big five personality traits: ~40% But what, exactly, does "heritability" mean? I used to have a...

Since around 2009, methamphetamines have been made with phenylacetone (P2P). Is there a chemical different causing schizophrenia?

Sam Quinones was recently on Econtalk and in the Atlantic talking about methamphetamines and homelessness. He points out that “old” meth was made from ephedrine and that “new” meth is made from a chemical called Phenylacetone or P2P. He suggests...

How dangerous is it to drink acetone or nail-polish remover? Here's the key scientific facts, compared to ethanol.

Question: Should you drink acetone? Answer: No. But, out of interest, what if you did? This question is asked repeatedly on the web, with with many answers smugly stating that even tiny amounts of acetone will instantly kill you, you...

Does cola contain a drug to prevent you from throwing up from the sugar? And is Mexican Coke somehow better than American Coke?

Our first conspiracy theory has all the best qualities: 1. It sounds insane. 2. At first, the facts seem to support it. 3. Later, the facts lead to disquieting reevaluations of the medical system. So here's the conspiracy: "Cola has...

We believe stuff because it benefits us to believe it, not necessarily because it is true.

We believe stuff because it benefits us to believe it, not necessarily because it is true. Phrased that way, it seems like an obvious point—of course evolution made us like that, what else could it have done? But this has...

From atoms to big boom.

1. You’re in the mood for destruction. One day, you hear about this phenomenon of “radiation” where matter gives off energy. You think—perhaps you can harness this property of nature to make a big boom. Apparently matter is made of...

Some claims that test scores don't predict college success don't add up.

Here are some claims about how grades (GPA) and test scores (ACT) predict success in college. "In a study released this month, the University of Chicago Consortium on School Research found—after surveying more than 55,000 public high school graduates—that grade...

FROM BEING A WASTE TO THE BATHER AND COUNTRY, AND FOR MAKING IT BENEFICIAL TO THE PUBLICK

Europe is in an energy crisis. There are lots of things that might be done, but most are slow or expensive or painful or don't accomplish much. But here's a little daydream: 1. We use lots of energy to heat...

Visualizes Simpson's paradox, and shows how it's a deeper problem than many people realize.

It's hard to get into Oxford. Is it easier if your parents are rich? In 2013, The Guardian showed noticed something disturbing: Students from (expensive) independent schools were accepted more often that students from state schools (28% vs 20%). Of...

We like lists because they are an objectively good way to organize information. They allow readers to quickly and easily get what they want.

Say you want to learn about sleep. You see two articles: 1. "Theory and practice of effective sleep" 2. "Seven insights about sleep" Are you drawn to the second? I am. Of course, I hate myself for this because I've...

Why are prestigious outlets often so mediocre, and why do we read them anyway?

Here’s a thing that happens sometimes:

Like it or not, there's a clear scientific consensus

Look, I get it. Diet Coke tastes sweet because it has aspartame in it. Aspartame is a weird synthetic molecule that’s 200 times sweeter than sucrose. Half of the world’s aspartame is made by Ajinomoto of Tokyo—the same company that...

How likely are we to hit a barrier?

It's hard not to feel blinkered by recent AI progress. Every week there seems to be an AMAZING NEW SYSTEM with UNPRECEDENTED CAPABILITIES. It's impossible not to wonder what the future holds. Until recently, I thought progress was so dizzying...

Observations on the dynamics of writing and commenting.

I'm not famous or successful, so why should you care what I think? Well, I have some observations about the dynamics of writing on the internet that I think my (even more non-famous and non-successful) self would have benefited from...