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Stuff You Should Know

How the Scientific Method Works

19 Jun 2026

Transcription

Transcript generated automatically by AI and may contain errors.

Chapter 1: What is the scientific method and why is it important?

0.031 - 1.502 Kane Steinbrecher

This is an iHeart Podcast.

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2.631 - 29.738 Hoda Kotb

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30.139 - 34.223 Hoda Kotb

Joy 101 with Hoda Kotb is presented by CVS.

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35.992 - 59.125 Theo Henderson

For years, The Unhoused has been presented as a monolith in mainstream media. We The Unhoused is a podcast that's changing the narrative. I'm Theo Henderson, and I created the show while I was unhoused on the streets of Los Angeles. We've grown into a two-time Webby Award-winning podcast, the only podcast that shares unhoused stories and news from the unhoused perspective.

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59.145 - 65.374 Theo Henderson

Listen to We The Unhoused on the iHeartRadio app, Apple Podcasts, or wherever you get your podcasts.

65.962 - 74.813 Jarvis Landry

June is Black Music Month, and on the Drink Champs podcast, we're speaking with the hottest names in the culture, like Swae Lee. Do you realize how legendary you are?

75.174 - 86.208 Bobby Bones

I appreciate that. I be seeing it, but I'm like, man, I still got like so much more to do. Like Prince, he dropped like 30 albums. We dropped like five right now. That's the rate we got to be going. Yeah, that's a good attitude.

86.589 - 108.574 Josh Clark

No matter the era, Drink Champs brings you the biggest names and the most unfiltered conversations. Listen to Drink Champs from the Black Effect Podcast Network on the iHeartRadio app, Apple Podcasts, or wherever you get your podcasts. Hey, everybody. We're up to, I think, number five on the list of our science playlist. And this is a good one, Things We Believed Before the Scientific Method.

108.995 - 112.138 Josh Clark

I remember really enjoying this one, so I hope you dive in right now.

Chapter 2: How did ancient beliefs shape the understanding of science?

125.748 - 150.343 Josh Clark

I'm Josh, and there's Chuck and Jerry's here too. And this is Stuff You Should Know, the Let's Get Jiggy with Science edition. You know you're about to get jiggy, Chuck. With it? Yeah, with it. And it is this episode about what people believed before the scientific method. Yeah, you know, we have a pretty good episode on the scientific method.

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151.384 - 175.622 Josh Clark

And we have talked about some of this stuff here and there throughout the years, like, you know, early science. And it's easy to make fun of that stuff. Right. But we are here not to make fun of it and not necessarily to defend it, but to just put it into perspective of where these people were at the time. And you can see how a lot of this stuff made sense at the time. See?

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176.243 - 193.692 Josh Clark

That was as jiggy as it comes. All right. See you later. Yeah, that was really well put. And just as a refresher real quick so you don't have to pause and go back and listen to our scientific method episode. You can if you want, but if you don't feel like doing that, the scientific method is just basically a plan.

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193.672 - 219.588 Josh Clark

to keep yourself from going down blind alleys or being misled by what seems to be the case but isn't necessarily the case. Sometimes your own eyes can lie to you. And it basically says, based on data you've collected or things you've observed, form a hypothesis, like this happens because of this. figure out how to test it, test it, look at the results. Did it support the hypothesis?

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219.929 - 240.646 Josh Clark

Did it not support the hypothesis? And either keep going forward or go back to square one. And by testing it, that's where the scientific method really shines. And before the scientific method, people didn't do that. They used their eyes, the empiricists. They formed theories, the rationalists or dogmatists.

Chapter 3: What were the four humors and their significance in early medicine?

241.187 - 262.137 Josh Clark

They performed experiments, the methodists. That's really what they called them. But they didn't actually, like, test this stuff. And so they were able to create these theories that were totally wrong. Sometimes we're really right, but in a lot of cases we're really wrong. And those things were adopted for like thousands of years in some cases.

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262.505 - 281.185 Josh Clark

Yeah, because a lot of science was mixed up with philosophy for a long, long time. And as you'll see with some of these, like, if you had a good enough sort of philosophical thought about something and other people said, hey, that makes sense, and you kept repeating it a lot, then at the time people were like, well, that's good enough for us.

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281.846 - 292.377 Josh Clark

Yeah, which meant also if philosophy was in there, you had to also explain why more than be reliably consistent in its results. Yeah, exactly.

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293.133 - 320.902 Josh Clark

So one of the first ones that I think people think of when they think of ancient science is the four humors, humors of medicine, which was something that came along from Hippocrates all the way back in, I think, the 4th or 5th century BCE and was in place until the 1600s, essentially. That was how people practiced medicine. Yeah. Yeah, I mean, that's a long run.

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320.963 - 345.887 Josh Clark

Hippocrates probably did not make it up himself. It's theorized that he probably brought it over, or he didn't necessarily, but it was brought over to the Greeks, maybe from India, maybe from Egypt. But Hippocrates ran with it, and then Galen really ran with it. And Galen is who is probably most people think of Galen when they think of the humors, the four humors. Right.

346.448 - 371.664 Josh Clark

But humor, H-U-M-O-R, is Latin meaning fluid. And that's basically what they're talking about with the four humors. I almost said humids. The four humors, which are the fluids of the body. And we should just name them quickly, I think. Yeah. Phlegm. You got blood. And then you got the two bile. You got black bile and yellow bile.

372.025 - 372.145

Right.

Chapter 4: How did the concept of elements evolve in ancient philosophy?

372.277 - 398.402 Josh Clark

Right. And those things are not just the sum total of what was studied or what was responsible for ill health or for health. They almost stood in for a bunch of other things, too, like your energy could be low or angry or overly happy. And all those were associated with different humors. Right. So I think it was Palomar University website on it basically put it like,

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398.382 - 420.673 Josh Clark

More than just fluids themselves, you could think of the humors as those things that flow. Fluids, energy, that kind of stuff. And all these humors also had complexions. They were either wet or dry, cold or hot. And there were combinations of those. But not literally that.

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421.475 - 421.535 Bobby Bones

No.

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421.555 - 447.307 Josh Clark

It's a little confusing. It's super duper confusing. And I think this is an example of what happens when people over a couple thousand years kind of contribute to stuff. It gets a little off kilter. Yeah, like blood is hot and wet, but that didn't necessarily mean they're saying that when you touch blood, it was hot to the touch. Right. It's almost like a synesthesic approach to the body.

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447.568 - 468.261 Josh Clark

Yeah, well put. So like water is cold. Boiling water is cold. Ice is hot. Right. I don't understand some of it. Exactly. Right. So the upshot of it was that each humor was hot and hot or it had a temperature and a humidity. Yeah.

Chapter 5: What role did Aristotle play in shaping scientific thought?

468.421 - 496.893 Josh Clark

Hot or cold, wet or dry. And depending on what symptoms you had, you either had like a hot and wet humor. Disease, right? Or a cold and dry disease. And the treatment was to use the opposite. So I think pneumonia was cold and wet because it came on during the winter, which is very cold and wet around the Mediterranean at the time. And you would treat that with something warm and dry.

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497.073 - 515.278 Josh Clark

So herbs were warm and dry. You would use herbs to treat pneumonia. And the whole pursuit was just to regain balance. Each person had a pre, I guess, ordained balance of those four humors. And when they got out of whack, that's when you came down with the disease.

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515.596 - 528.169 Josh Clark

Yeah, so you've heard about forcing yourself to vomit or the bleeding, the old great Steve Martin sketch from Saturday Night Live years ago. You just need a good bleeding. That's what they were doing.

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528.189 - 552.277 Josh Clark

They were trying to get you back into balance by removing whatever humor they thought, you know, either the phlegm or the blood thought you had an excess of at the time to bring you back into homeostasis. So they were, again, they were wrong, but, you know, things like homeostasis, they were on the right track with some of these ideas at least. For sure. Yeah.

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552.297 - 570.542 Josh Clark

And that's, I think, kind of a recurring theme in this. When you look in on ancient science and ancient knowledge, it's like they kind of had like the contours of some of these. And that's a good example of that. Contours. Exactly. So it wasn't until Paracelsus. who came up, I think, in our xenobiotics episode.

572.445 - 592.06 Josh Clark

When he came along, he was definitely an outlier and an outsider thinker, and he was like, I think Galen was just really wrong. This stuff just doesn't quite add up. And I think William Harvey, who was an English, I think, physician, in 1616, he showed that the heart pumps blood. Right.

Chapter 6: How did the introduction of the microscope change scientific understanding?

592.04 - 615.633 Josh Clark

And that just completely undermined the humoral medicine thought that these humors moved around the body through attractive forces. Yeah. And and, you know, again, this is one of those kind of what I said in the intro, like this is one of those that people believed and got on board with because it made sense at the time. It was something that they were very persistent about.

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616.454 - 639.43 Josh Clark

And if you're persistent about something, even if it wasn't proven at the time, that was that was enough for people. Yeah. It was the consistency of sort of the idea that's repeated over and over that got people on board for a long time, hundreds of years. Yeah. And I think it's interesting, like the humoral medicine is still one of the foundations of Ayurvedic medicine from India.

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639.49 - 662.342 Josh Clark

And that's why they think it might have come from India originally to Greece. Mm-hmm. But the basis of it is that you use like movement and diet to keep your humors in balance. And that was kind of the basis of the Greek interpretation too. But then they took it too far and started using it to treat disease and doing all sorts of weird stuff.

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663.163 - 690.785 Josh Clark

So now we have modern medicine and modern medicine likes to disown its predecessors. But it wouldn't be here if we didn't have things like humoral medicine first. Up with Galen. You have sneakily not mentioned that this is a top five. Oh, that's right. It's a top five, maybe part one of a top 10. Who knows? Yeah, we'll see. Should we try and knock out the next one? Yeah, I say that. I say so.

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691.006 - 696.617 Josh Clark

I agree. That's what I say. All right. This one's interesting. And this has to do with.

Chapter 7: What was spontaneous generation and how was it debunked?

698.2 - 728.314 Josh Clark

It sounds a little wacky, but again, you have to keep in mind where they were at the time. So this is the idea put forth by, how do you pronounce that name? I'm going with Eudoxus. Eudoxus? Yeah, I think Eudoxus. All right. Eudoxus of Nidos was born between 395 and 390 B.C.C., lived to kind of early to mid 50s.

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729.236 - 750.787 Josh Clark

And he came along and said, all right, I've got some pretty radical things to throw out there that are fivefold. Part one, the Earth is the center of the universe. Check. And everyone was like, sounds reasonable. And it was reasonable at the time, and we'll talk about that in a second. Number two, all celestial motion is circular. Roger. Number three, all celestial motion is regular.

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750.827 - 763.061 Josh Clark

Number four, the center of the path of any celestial motion is the same as the center of its motion. All right. And then number five, the center of all celestial motion is the center of the universe.

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764.182 - 785.675 Josh Clark

And I said, you know, he can't be blamed for that first one, even though he was wrong about geocentrism. At the time, when you stood on the planet and you looked up and you saw, you know, stars sort of moving and other things moving in a circle around the Earth, you probably felt like you were the center of the universe. Exactly. I mean, it would just make sense.

785.695 - 805.2 Josh Clark

You'd be a fool to think otherwise because there's no indication that the Earth itself is also moving. It seems like everything else is moving around the Earth. So it's not so far-fetched to think that, oh, the Earth is the center of the universe. Part of it also tied into that natural philosophy thing where... Humans were the center of the universe. They were like the creation of the gods.

805.821 - 810.091 Josh Clark

And of course, why would Earth be anything but the center of the universe?

Chapter 8: How does modern science view the contributions of ancient thinkers?

810.472 - 833.322 Josh Clark

But it also had to do with practical stuff like what they saw with their own eyes. Yeah, like he wasn't the first person to come up with this. Like this had been around for a long, long time and he was just sort of officially reaffirming it. But he was the first person to give us a model of the movement of the cosmos, celestial bodies moving through the sky and trying to explain it.

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833.302 - 849.488 Josh Clark

And somebody who came before him, Anaximenes, I'm going with that. He was the first one to say, hey, I've got it. This is back in the 6th century BCE. It's shells. Everything exists in shells, man. Yeah.

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852.202 - 880.817 Josh Clark

Yeah, the idea that like, I mean, it almost sounds like he was creating little miniature galaxies and like everything we see is contained inside its own little miniature galaxy, like literally contained in a shell. Yes, but all of these shells are rotating in different orbits around Earth. Right. But they can affect one another, right? Or did that come along later? That came along with Eudoxus.

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880.877 - 905.769 Josh Clark

So Anaximenes basically said it's shells. And then Eudoxus was the first one to really lay out an explanation, a theory for how these shells worked. And I think he came up with 27 different shells. Some shells had shells within shells. It got really kind of crazy. But the point of this isn't like because Eudoxus was mad or anything like that.

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906.07 - 922.099 Josh Clark

He had to keep adding shells to explain things they saw in the night sky. Yeah, so it's almost like they dug themselves a bit of a hole and instead of course correcting and saying, well, maybe we should look into a different theory or something, they were just like kept adding shells. Exactly.

922.68 - 945.85 Josh Clark

So one of the big problems was that, first of all, the Earth is not the center of the universe, but also that the motion of celestial bodies is not circular and it's not regular. He was wrong on everything. He was basically wrong, yeah, on all five of those points. But the reason that he thought it was circular was that circles were perfect.

945.91 - 961.032 Josh Clark

And again, the Earth was the center of the universe and it was created by the gods. So, of course, it was perfect. But other people have pointed out that it had to be circular if he was going to apply math because non-circular math for movement hadn't really been –

961.012 - 983.121 Josh Clark

created yet yeah that's basically that's all he had to work with was circular motion so if he was going to actually investigate this and try to figure it out with math he had to be circular so just by by what he had available at the time that's why this motion was supposedly circular but that was a huge boondoggle because it's not circular as we found out finally from kepler

983.101 - 1004.916 Josh Clark

Who came along, I think, the 17th century. So, again, this is like 2,000 years. People are like, shells is where it's at. Even Copernicus, who said he was the first one to really say the sun is at the center of the universe. And what he was talking about was the solar system. And he created a revolution with that. He still was saying, but it's all within shells.

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