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From Freakonomics Radio, a series about the economics of higher education. The supply and the demand, the controversies and the hypocrisies, the answers and the questions. Why are more women going to college than men? What happens when Black and Hispanic students lose admissions advantages? How does the marketplace for higher education operate?
I tell you something, it's a darn good question. Freakonomics Radio goes back to school. A series from the Freakonomics Radio podcast. Hey, jerk, don't pee on the floor, please.
I'm Angela Duckworth. I'm Stephen Dubner. And you're listening to No Stupid Questions. Today on the show, can posting a sign make people change their behavior? A sign that says, just think how proud your mother would be to know that you're washing your hands right now. Maybe that's the sign we all need. Stephen, we have an email from one Adam Wick who
of Pittsburgh, Pennsylvania. City of bridges, city of Steelers and pirates and penguins. And Carnegie Mellon University. And they also, can we just say, apropos of nothing other than the fact that Adam Wick is from Pittsburgh, Pittsburgh is a model city in transitioning from what used to be called blue collar work or heavy industrial to what's sometimes called the knowledge economy. It's phenomenal. Yeah. So anyway, there should be more Pittsburghs. It's also just lovely. So-
Adam Wick writes, does posting signs cause behavioral change? And then he elaborates, a colleague approached me at work asking for help in improving the design of a sign that he was going to post in the men's room.
The sign provided instructions for how to dry your hands with only one paper towel. Wash your hands, shake them into the sink at least 12 times, grab a paper towel, fold it in half one time, and use it to dry your hands. Although the method does work well, I'm wondering if even an amazing sign has a chance of creating behavioral change. Cheers, Adam Wick, Pittsburgh, Pennsylvania.
Pennsylvania. I thought this was going to be about how to increase hand hygiene, but it sounds as if it's more about how to dry your hands with only one paper towel as opposed to more. It's more about conserving paper towels than about spreading germs. And there's a whole debate about whether paper towels in a bathroom are better than electric dryers in terms of energy consumption and so on. I will say years and years and years ago, I remember writing
writing about how most signs that encourage people to wash their hands are put in the wrong place, which is over the sink, which is where the people... They're already there. You're preaching to the converted. Right. Rule number one of signposting is...
They need to be in the place where the offenders will see them as opposed to the cooperators. But I like Adam's question because I feel like this is at the sweet spot of what you do and what I do. He's asking, do signs which are interpreted in our brains and bodies actually change behavior? If they do work, when do they work and why?
If you think about it, you could imagine a variety of issues with signs. Maybe people ignore a sign or somehow it just doesn't make an impression. Maybe it works, but only on a few of the people, or maybe it works even for many people, but then it wears off. The novelty goes away. And you can even imagine cases in which signs backfire, where they perhaps don't
the behavior you're trying to stop or even decrease the behavior you're trying to encourage. Right. So I want to talk...
for a moment about what are called DMSs, Dynamic Message Signs on Highways. Angela, I'm sure you've been driving or driven around enough to see these increasingly, yes? Yes, the ones that say your speed is 36 or however fast you're driving. Yeah, they can tell you how fast you're going or they can include all different sorts of warning messages, cautions, things like that. Like fortune cookie messages, but all about safe driving. Yeah.
What's your sense, just as an individual human, how that sign might work to change your behavior? I guess it might work in part because it's new information, so it counters habituation. And then I guess if you are kind of oblivious to how quickly you're going, which I think can happen when you are going at a constant velocity, but it's not changeable.
changing, we don't have a feeling of going fast. We can only feel speeding up and slowing down. So maybe it draws your attention to something you wouldn't otherwise notice. So all of those things, Stephen, make me feel quite optimistic about the effect of those dynamic signs.
Well, there is research from the journal Transportation Research Record published in 2021. The paper is called Does Displaying Safety Messages on Dynamic Message Signs Have Measurable Impacts on Crash Risk?
They write, safety message data were collected from a total of 202 DMS, or dynamic message signs, on freeways across the state of Michigan between 2014 and 2018. These data were integrated with traffic volume, roadway geometry, meaning you're controlling for difficult and easy passages of highway, let's say, and crash data for segments that were located downstream of each DMS. So,
The results did not show any significant difference with respect to total crashes. So that's bad news. Marginal declines in nighttime crashes were observed at locations with more frequent messages related to impaired driving, like, hey, if you're drunk, get out and walk. Although drunk walking, we actually argued in Super Freakonomics, is more dangerous per mile than drunk driving, but that's a different story. Maybe for the person who's drunk, but maybe not for other people. It
Exactly. It's hard to kill someone else when you're walking drunk.
But then they write, finally, speeding related crashes were significantly less frequent near DMS. These signs that showed higher numbers of messages related to speeding or tailgating. So maybe not hugely positive findings, but that's positive, which might lead one to conclude that highway signage works, at least to some degree. Would you accept that as a shorthand? I will accept that. I mean, I...
was at a fundraiser for my husband, Jason, yet another of his philanthropic slash civic causes. He's a big advocate of pedestrian safety and cyclist safety. Anyway, we recently had an event to raise money for this pack aimed at improving the safety of cyclists
and pedestrians in the state of Pennsylvania. The invited guest was Eric Guerra, who's a professor at my university, University of Pennsylvania. And he essentially specializes in the interface of vehicles
the built environment and transportation, like highways, crosswalks, signage, and then humans. So drivers, pedestrians, cyclists. And I asked him, can you just summarize the literature for me, what works? One of the things he said is that one of the best ways to do it is not necessarily signs per se, but actually the roadways themselves. So you can put up all the
up all the signs you want. But if it's like a huge straight shot, people are going to go really fast. If you have a really windy, small, narrow road, then people are going to go slower. So I think a lot of the innovation here is not signs per se, but the structure of where we're driving itself.
But that said, if you're working with a built environment that's already built, which of course many safety experts are, you think, what can I add? And if you add signs, this paper from Transportation Research Records seems to show there's some gain to that. But you knew there was a but coming, did you not? There's always a but. There's an even more recent paper published in Science.com.
by Jonathan Hall and Joshua Madsen. Jonathan Hall is an economist at the University of Toronto. The other, Madsen, is a professor of accounting, University of Minnesota. And they write the following, although behavioral interventions are designed to seize attention, little consideration has been given to the costs of doing so. In other words, that sign up there
We want it to produce a benefit. Might it cost something too? They write, we estimated these costs in the context of a safety campaign that to encourage safe driving displays traffic fatality counts on highway dynamic message signs
for one week each month. That was such antiseptic language. Fatality counts, like the number of people who have died. Yeah, like eight people died on this highway in the last month, let's say. And again, there seems to be an experimental instrument here, which is the signs are only going up for one week each month, which means that you can measure the week they're up and when they're down.
Very clever. You know, that is possibly going to have the effect of distracting me just because it's so kind of like, oh, my God. And by the way, since it didn't tell me how fast I was going, it distracts me and doesn't necessarily get me to slow down either.
Right. It doesn't put you in with the group of speeders or not speeders. It puts you in with the group of alive versus dead. And all of a sudden you just saw the number of dead. I'm going to predict that it is either neutral because the costs equal the benefits or I don't know, possibly neutral.
bad? I'm not sure. I'll read on here from the paper by Hall and Madsen. We found that crashes increase statewide during campaign weeks. That means the weeks when the signs are running, which is inconsistent with any benefits. Contrary to policymakers' expectations, they write, we found that displaying fatality messages increases the number of traffic crashes.
So they conclude back of the envelope calculations suggest that this campaign, again, a campaign that's designed to save lives, causes an additional twenty six hundred crashes and sixteen fatalities per year in Texas alone with the social cost reduced.
of $377 million each year. How nuts is that? Or maybe if you're Angela Duckworth and you know the way the human mind works, maybe it's not so nuts. Well, look, I'm not going to pretend that I could have guessed that right off the bat. I could see it going either way. But I'm curious whether these scientists had any explanation for why it is. They propose a number of
hypotheses and the one that they land on, one proposed explanation they write for this surprising finding is that these, quote, in your face or, quote, sobering, negatively framed messages seize too much attention.
That is, they are too salient, interfering with drivers' ability to respond to changes in traffic conditions. So, Angela, I am really glad that this question about how to fold a paper towel to dry your hands has brought us to this question, which I consider a little bit higher stakes, because
It's not just with traffic safety. It's with a lot of things. I keep coming across this word salience in psychology, but also in econ papers too, which is this argument that once you become aware of something, when something becomes fully or largely salient, it really affects our behaviors in ways that you might not anticipate.
Can you just talk about salience from your perspective for a minute? There's an aperture, if you will, that can be fully dilated and you're completely aware of something or completely closed where it's happening, but you just didn't notice. Say there's a sign by the side of the highway that you didn't look at. For you, it's
It didn't exist. So salience is the extent to which something enters your field of view, your awareness, and it can be anywhere from zero to 100 percent. When we're in the flow state and we're completely engaged in activity, all of our attention is going to what we're doing. And the opposite of that would be like complete neglect.
But in a more complicated interaction, let's say you're driving down the highway, you see the sign. What these scholars are arguing is that salience increases essentially bad outcomes of traffic crashes. How can that be? Because attention is going to the sign. So I look up and I'm
probably not only looking away from what's in front of me, perhaps for that moment, and this is complete speculation, the emotion of that, like, you know, two people died on this highway in the last year. I maybe have memories or thoughts triggered of people I know
who died. I mean, who knows what's going on? But basically, I want to make the point that when we talk about attention, it's not only attention to this object versus that object, the sign versus the odometer or the steering wheel versus the person next to me. But there's also a kind of internal spotlight. Is my attention going to one thought or the other thought? When someone's driving, you really want their attention externally to be on the cars around them and then internally to be on driving.
I guess that's not the scenario I was picturing. I was picturing a scenario whereby it's not that I'm distracted in the moment by the sign and getting a crash within the next half mile. It's that I read that and I think about, oh my goodness, this thing I'm doing is dangerous.
Theoretically, it could make me more careful, but theoretically, it could make me tense up. We know that most of us don't respond well to pressure. If you look at test taking and sports and things like that, it takes a lot of practice and experience to deal well with pressure. That was the mechanism that I was imagining
was the response to salience. But I don't know. We're both speculating here. I don't think this study, just from what they did, would be able to say that one account is more right than the other. By the way, they're both possible, but they both do start with attention going to that sign. It does remind me of another story. I bet you know this story because this is a famous story and it was popularized by someone that you are a great admirer of. Do you know the story of
of the Petrified National Forest in Arizona and what happened there? - I do know the story. This is Bob Cialdini, yeah? - This is Bob Cialdini. And this was some time ago, and I don't know the story that well, but from what I recall, it goes something like this. There's the Petrified Forest National Park in Arizona where Cialdini lives. The problem is that people would go in and steal pieces of petrified wood and crystals from the forest floor.
that's plainly not good for the integrity of the forest. They would just put it in their pocket to take home and put on a shelf. I think all of us can imagine that sentiment. It's just like, oh my gosh, it's so cute. It's one little thing. And there's so much of it. It's a whole forest. And so as he described it, there's a sign as you come in the park that says, because so many people are stealing wood...
at the rate of nearly a ton a month, this is undermining the integrity of the forest. So Cialdini had a graduate student working with him. The student and his fiance went to the forest and saw the sign.
And the student said that before he even finished reading the sign, he heard his fiance say to him, oh, we better get ours now before it all disappears. So he was wondering, like, what on earth could possibly produce that sort of result? Cialdini, being a scientist, turned this into an experiment. And
And they ended up putting up a sign or a number of signs in front of different pathways running through the forest. And they actually, as he put it, salted those pathways with pieces of petrified wood.
And then they look to measure the effect of the sign on stealing the wood. In other words, if we have a sign that says, please don't steal the wood, too many people are stealing wood, what happens? Compared to no sign, right? Compared to no sign and having the sign tripled the rate of theft. Is that salience? Is that what that is? It's salience.
But signs always convey something in addition to that, which is some kind of message. And in the case of the petrified forest, it is signaling to you, everybody steals wood from the petrified forest. What's wrong with you? Why haven't you stolen your piece yet? It's conveying a social norm in the terminology that Cialdini might use. I think it's
You also want to think about what that sign is doing then in this bathroom that Adam talks about. The sign provides instructions for how to dry your hands with only one paper towel, etc. I think in some ways what this sign might be doing is that if it just says, like, don't forget to wash your hands, it's communicating to you, you probably would have forgotten, we have to scold people, we have to put up a sign in the bathroom because nobody's washing their hands. It's not communicating that, it's
Communicating with this kind of pro tip, this hack so that you can only use one paper towel, that to me is really important because as a practical matter, you want signs that are not only going to bring things to the top of mind to make things salient, but also carry some information that makes people more inclined as opposed to less inclined to do the wanted behavior.
So Angie, I do think it'd be really interesting to hear from listeners about signs that have worked or failed to work on them, maybe. What do you think? I think that would be fantastic. I want to hear sign stories. Send us your sign stories. Make a voice memo. Just make a recording with your phone. Do it in a quiet place. Speak nice and clearly. Include your name and email it to us at nsq at Freakonomics.com. Maybe we can share it in a future episode.
Still to come on No Stupid Questions, what happens when even the most intelligent, informed people refuse to follow the signs? They were going to jump out from their hiding spot, scowl at them, and then take their name and publicly post it to shame them. No Stupid Questions is sponsored by Rosetta Stone. Traveling to a place where people don't speak a lot of English? Then Rosetta Stone, one of the most trusted language learning programs, is for you.
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Now, back to Stephen and Angela's conversation about how signage affects human behavior.
When we see a sign, I think one thing we don't necessarily think hard about but we feel is who's the author of that sign? Who is the authority figure who's posting it or asking that it be posted?
who is the intended beneficiary of the behavior? It could be you, it could be other people. And also, is the message of the sign kind of dictatorial or is it more collaborative? Is it complimentary? Is it insulting? One of the most famous examples from the book Nudge by Thaler and Sunstein was about
putting an image of a fly, a housefly on a urinal in the airport. I think it was the airport in Amsterdam. Thaler and Sunstein didn't come up with this. They just thought it was a great example of nudge framework, which is if you're a guy standing there ready to pee, rather than peeing on the wall or on the floor, which men sometimes do, if there's a fly, oh, it's a game. I have a target. I'm
That's a sign, but it does a couple other things, too. It does gamify it. It makes it fun. And it makes you a participant in the behavior as opposed to a sign that says, hey, jerk, don't pee on the floor, please. You know, I read that little anecdote and I
not an expert on men's urinals. Not having a penis, I just missed it as a useless anecdote. Has it kind of taken off? Are there little cute targets in men's urinals all over the world because of this trick? A lot of people read that book, Nudge. I
I've definitely seen flies or bullseyes in more urinals than there used to be, but I would not say it's universal. I think there should be more of that. And I do think that is not only a reminder, but it's communicating something which is certainly not insulting or dictatorial. I mean, I have a memory of this speed sign incident.
in a part of a suburb of Philadelphia where I used to live called Narberth. And there was this long cul-de-sac, a street called Narbrook Park. And in the park, there was a speed limit sign that said seven and a half miles. And I thought it was incredibly clever.
clever. I can't say whether it worked or not. There wasn't a control group. But I think what that sign is communicating is, hey, we want you to slow down. The seven and a half mile thing is a little cheeky, but there's nothing insulting about it. You want signs that both work on your attention, but don't
backfire by making you feel suspicious or antagonistic in any way. It's so interesting. You know, I really do empathize, whether it's with the company that Adam is talking about or someone running a highway department, someone trying to create safety anywhere. It's hard to predict what will work, whether it's a sign or a kind of encouragement, even incentives. Going back to handwashing, which is where this conversation began, I don't know if I've ever told you this story about...
how one of the world's best hospitals found that their hand hygiene rate among doctors was only about 60%. This was Cedars-Sinai Medical Center in Los Angeles. Have I ever told you this story, Angela? I don't think so. So the story of hand hygiene compliance in hospitals, it's a big deal because of all the things that cause problems, especially bacterial infection. And
Poor hand hygiene is not only a big contributor, but it's also an easy win. If you can get people to wash their hands or disinfect their hands routinely, it is simple, cheap, and effective. And yet, as I mentioned, at Cedars-Sinai, which is a world-class hospital, they found that the hand hygiene rate among their physicians was about 60%. And they found this not by asking in a survey, which will give you higher numbers, but by
but by deputizing nurses essentially to spy on doctors. And that's how you create the baseline figure from which you try to measure. And so when the leadership of the hospital learned that their rate was only about 60%, they were mortified. And they did what we, especially in the US and other places do when you take a problem really seriously, they decided to form a committee. It was called-
The Cedars-Sinai Medical Center Chief of Staff Hand Hygiene Advisory Committee. That rolls off the tongue. So they got together and these were, I think, maybe 15 or 20 of the top officials in the hospital, many of whom were medical doctors themselves. They decided...
What we're going to do to solve this problem is we are going to communicate to our physicians here that we expect and appreciate 100% hand hygiene compliance. And so they wrote a memo because that's what committees do. Especially ones with long acronyms. And they distributed the memo. And would you think that the memo increased hand hygiene compliance or no? I would imagine it might have decreased hand hygiene compliance. Well, it didn't decrease, thankfully, but it didn't increase it either.
So then they had a totally different idea. They thought, what if we take our message to the wards where the doctors are actually seeing the patients and try to change the messaging there? So they formed the Posse Patrol Program Subcommittee of the Cedars-Sinai Medical Center Chief of Staff Hand Hygiene Advisory Committee. And this would be composed of two or three members of the big committee,
They would go into a patient's room and literally hide and wait for a doctor to come in and either
or fail to wash his or her hands. And their initial plan was as an incentive, they were going to use not a carrot, but a stick. If they caught someone not washing, they were going to jump out from their hiding spot. And I guess, I don't know, scowl at them and then take their name and publicly post it to shame them. Very Singapore. And then they thought, you know what, what if instead of a stick, we use a carrot and
and they came up with a plan, they still hid behind a wall or curtain, whatever. But if they heard a doctor successfully wash his or her hands, they would jump out, they would applaud and give the doctor a $10 Starbucks card as a reward for successfully washing the hands. Now, what would you guess would be the outcome of that incentive? I don't know how sustainable this is, but I would imagine that that would work better. Right.
It worked well in that people loved it. Some doctors would even game the system when they would hear the posse patrol program was on their floor, they'd run up there and wash their hands, try to get cards.
But it did not raise the rate overall. I mean, you could imagine a number of reasons why. Maybe if I got the Starbucks card in room 804 and I go into room 809, I know the posse's not there. Maybe I skip it there. So that made people feel good, but it didn't work. What finally worked was back at a meeting of the whole big committee, someone spoke up who hadn't spoken up before. It was the staff epidemiologist. And she said-
I have an idea. It's not actually a solution to the problem, but it's an idea for maybe helping us think about the problem a little bit differently. And she pulled out a bag with 20 Petri dishes, the kind of thing you take a sample from and culture it in the lab. Grow bacteria. And she said, here we are, the senior leadership of the hospital, telling everyone else,
how they're failing to wash their hands. What about us? Do we have these bacteria on our hands? So she asked everyone to lay their palms in these Petri dishes and she wrapped them up and she sent them to the lab. And it turns out that the majority of those palm prints were teeming with the bacteria that other doctors were failing to get rid of. And
That was a sobering moment for them. And they felt not only are we not solving the problem, but we're contributing to it. And that's when the chief of staff came up with what was ultimately the winning solution, which was, he said, what if we take a photograph of one of these petri dishes with these really scary looking bacteria on it and let it be known that it belonged to one of us, the leadership?
And what if we make it the screensaver on every computer in the hospital? And they did. And that sign worked. Did it really? I have to say, I'm surprised.
I was surprised, too. I think this goes to the fact how hard it is to predict human behavior, whether it's in response to a sign or any other kind of incentive. I'm also going to register some skepticism that it worked in the long run. Why would you say that? It's not just Cedars-Sinai. I have been working on this data set with Colin Kammerer and Katie Milkman. Katie is the person responsible.
among us who originally acquired the data set on handwashing in a hospital system, a set of hospitals. And the lead author is Anastasia Bulyaskaya. We're looking at hand hygiene, and we have better data than looking from behind curtains in hospital rooms because these physicians and nurses wore transponders. And when you approach the sink, you can reliably know
whether or not the person has washed their hands. And I believe in our data set, it is fewer than 50%. So it's much lower than what you're seeing in Cedars-Sinai. And I'll just say that it's just very hard to change this behavior. I would guess that that screensaver might have an effect, but
for a little while. But what we're seeing in this data is that it takes an extremely long time to form a hand-washing habit. And this kind of gets back to that observation that maybe better than street signs is changing the road itself. Like when you make a speed bump on a road or you make it narrow or you make rumble strips on the side, you make certain kinds of driving immediately more
pleasurable than others, like driving slowly, driving carefully. I think signs have some utility, but it's limited. And to that point, in terms of the Cedars-Sinai story, the sign worked for quite a while. In fact, it worked so well that other hospitals began to write Cedars-Sinai and say, hey, could you send us that image of your doctor's bacterial hands?
But if I recall correctly, it did work for a while and then it diminished exactly like you said, because habits are hard to form. But when you talk about traffic design or the built environment having so much more power than, let's say, road signs, I think in the hand hygiene space, it's exactly the same thing. The gains that are being made are much more when you look at hospitals that use antimicrobial surfaces, for instance. And then...
There are some easy gains. You know, if you think about it, a physician's necktie, if they're the kind of person that wears a necktie, can act over the course of days, weeks, and months as a sort of giant germ swab, just kind of gathering stuff.
And men, I don't know if you know this about men, but we have a very concrete dry cleaning calculus. How many times you can wear a particular item of clothing before it has to be cleaned. Oh, does anybody ever clean their ties? Yeah, the ties at the bottom of the list. That's so interesting. I hadn't thought about that.
The British Medical Association, I believe, was the institution that decided to ban the wearing of neckties in hospitals because they thought, listen, the necktie is this ancient symbol that you're an important person. Well, you're a doctor. We know. You don't have to remind us.
But if your necktie cannot serve as a giant germ swab in this hospital and save one life, we think that's probably more important. So that's another example where let's call it the built environment or the environment generally
as opposed to relying on signs that might or might not change behavior. And even if they do, might only change it for a little bit, sounds like very much the way to go. So in response to Adam Wick, does posting signs cause behavioral change?
I think your answer would be that maybe sometimes a little bit, but it often backfires. But changing the structure is a really good idea for causing behavioral change. Do I have that right? You have it right. According to me, the problem is that built environments are built and we're often left with structures.
either really expensive changes or tweaks on the margin, which is what signs are. I mean, I could imagine, however, that someone as clever as you could work with your also clever colleagues like Colin Kammerer and Katie Milkman to come up
with a science of sign making that is better. Because look, as you like to say, both and. Let's use all the tools in the arsenal. And so sometimes you're going to have an environment that you can't rebuild and that signs can be at least somewhat useful. I mean,
If you think about what we were discussing earlier, who is the author of the sign? Who's the authority behind it? Who are you trying to benefit? You know, maybe a sign that says over the sink, just think how proud your mother would be to know that you're washing your hands right now. Maybe that's the sign we all need. I don't know if it's the sign we all need, but how about this? I think if you could make it
A game where it tells you how many seconds the water's been on, and you don't want to go over 20 because you don't want to waste water, but you don't want to be under 20. And then when you wash your hands for exactly 20 seconds, a random Beyonce lyric will play. You don't know which one. I think that's the kind of thing that would make it salient. It would be not dictatorial. It wouldn't be critical or finger-wagging, but it would be actually bordering on structural. Gosh.
I love it. So I will say that this is a great homework assignment for Colin Cameron, Katie Milkman, but we're going to need a budget. That is such an amazingly good idea, or at least amazingly appealing idea. You'll have to see if it actually is good. So Angela, I'm in a hurry to leave this conversation, go to the bathroom to hear my Beyonce. So thank you. Okay, good. Don't forget to wash your hands.
No Stupid Questions is produced by me, Rebecca Lee Douglas. And now here's a fact check of today's conversation. Stephen says that he's unsure about certain details in the story about flies etched into urinals from Richard Thaler and Cass Sunstein's 2008 book Nudge. As Stephen suspected, the example came from Amsterdam, specifically the men's restrooms in Schiphol Airport.
Ad Kibum, an economist who, at the time, was the director of Skipple's building expansion, came up with the idea. His staff reportedly found that fly in urinal trials reduced spillage by a total of 80%. I wasn't
able to find reliable figures on the percentage of men's restrooms that use urinal etchings today. But I did see that one can now purchase a diverse range of urinal bullseyes and targets at affordable prices from websites like Amazon and Etsy.
Later, Stephen tells the story of the Cedars-Sinai Medical Chief of Staff Hand Hygiene Advisory Committee, which he initially wrote about with Freakonomics co-author Steve Levitt in a 2006 article for The New York Times. He recalls that the Starbucks card incentive was well-received, but didn't actually raise handwashing rates. This isn't entirely correct.
Compliance did in fact rise to about 80% from 65%, but this was deemed unsatisfactory as the commission wanted at least 90% compliance. By comparison, the photograph of the Petri dishes led to nearly 100% compliance.
According to Richard Riggs, the chief medical officer at Cedars-Sinai, the hospital no longer uses the image, but he does stress that they still have, quote, "...exemplary rates of compliance with hand hygiene."
Finally, Stephen mentions a British medical association ban on neckties. The policy was actually instituted by the UK's Department of Health and Social Care. The British Medical Association is a trade union for doctors. Many of its members were affected by the ban.
NHS dress code currently indicates that employees should not only avoid neckties, but also lanyards, necklaces, hoop earrings, and rings. Bow ties are considered safe. That's it for the fact check. Before we wrap today's show, let's hear your thoughts on last week's episode on the midlife crisis. We asked listeners to send us voice memos sharing their own stories and experiences.
Hi, this is in response to the midlife crisis episode. I'd like to say I think I'm too young yet to have a midlife crisis as well because I'm 33, but I think I did have a quarter life crisis at 25. And I think it was entirely because of thinking if you've made the right decisions so far. So I chose to be an architect and in the UK that takes a minimum of seven years and it took me 10 years. And at 25, I was more than halfway through it, I guess, and really just thinking about whether it's what I wanted to do with the rest of my life.
And for me, it was. I have my own business now and I really enjoy it. But the whole process of almost like acute worry and depression of really like, is this the right thing for me? I think that's kind of what a midlife crisis is, in my estimate, is kind of like an introspection on whether you've made the right choices up until that point and if you're happy with what you have. That was listener Ali Mudd. Many thanks to her and to everyone who sent us their thoughts.
Coming up next week on No Stupid Questions, what's so satisfying about holding a grudge? You lied to me. You cheated on me. You tripped me. You hurt me. That's next week on No Stupid Questions.
And remember, we'd still love to hear your thoughts and stories about signs. Just send a voice memo to nsq at Freakonomics.com with the subject line signs. Make sure to record someplace quiet and please keep your thoughts to under a minute. Maybe we'll include them on the show.
No Stupid Questions is part of the Freakonomics Radio Network, which also includes Freakonomics Radio, People I Mostly Admire, and Freakonomics MD. All our shows are produced by Stitcher and Renbud Radio. This episode was mixed by Eleanor Osborne. We had help this week from Jacob Clemente.
Our staff also includes Neil Carruth, Gabriel Roth, Greg Rippin, Julie Canfor, Morgan Levy, Zach Lipinski, Ryan Kelly, Jeremy Johnston, Jasmine Klinger, Emma Terrell, Lyric Bowditch, and Alina Coleman. We had additional research assistance from Anya Dubner. Our theme song is And She Was by Talking Heads.
Thanks for listening.
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