Latest / Stuff You Should Know / Was Malthus right about carrying capacity?
Transcript
- 0:00Speaker 1: Brought to you by the reinvented two thousand twelve camera.
- 0:03Speaker 1: It's ready. Are you welcome to Stuff You Should Know
- 0:08Speaker 1: from House Stuff Works dot Com? Hey, and welcome to
- 0:16Speaker 1: the podcast. I'm Josh Clark with me as always as
- 0:19Speaker 1: Charles W. Chuck Bryant sitting across from me. Um, and
- 0:24Speaker 1: that makes the Stuff you Should Know the podcast? There
- 0:28Speaker 1: you go on the infur nation. That's far is Is
- 0:31Speaker 1: there somebody fast forwarding through this part right now? Huh? Yes?
- 0:35Speaker 1: So Chuck? Right it is Chuck. Yes. Still have you
- 0:40Speaker 1: noticed how often I say right? Yeah? It's mind numbing.
- 0:44Speaker 1: Plus someone will right in and say, do you know
- 0:47Speaker 1: usually right all the time? And um, it sounds like
- 0:50Speaker 1: I'm eating hard candy all the time. I know that's
- 0:53Speaker 1: not the case. You've never eaten anything in here. I
- 0:55Speaker 1: can attest to that. Uh yeah, I'm overly celebratory, okay, Chuck. Uh.
- 1:02Speaker 1: As you know, I was a student of anthropology, still
- 1:05Speaker 1: consider myself such um And I first came upon this
- 1:10Speaker 1: term called carrying capacity when I was I took this
- 1:15Speaker 1: life changing anthropology class, right uh And I don't remember
- 1:19Speaker 1: the teacher's name anymore, but he was awesome. He introduced
- 1:22Speaker 1: me to probably my favorite article or essay of all time. Uh,
- 1:25Speaker 1: the worst Mistake in the History of the human race,
- 1:28Speaker 1: right by Jared Diamond. Awesome stuff. Um any dustin Diamond
- 1:33Speaker 1: by Mike Diamond, by Jared Diamond, the guy who wrote
- 1:36Speaker 1: Collapse and Guns, Germs and steel and stuff. Um, that's
- 1:40Speaker 1: required reading in my opinion. I just think you should
- 1:43Speaker 1: that essay, not necessarily as books. Um, but this I
- 1:48Speaker 1: was also introduced to carrying capacity and this there's this
- 1:51Speaker 1: really cool video. He showed it to get the point across.
- 1:53Speaker 1: And it's just a map of the world, right, and
- 1:56Speaker 1: it's um it's there's red dots. It shows population growth
- 2:00Speaker 1: and each red dot equals I think a million people.
- 2:03Speaker 1: And so it starts out in Africa, in Ethiopia, I
- 2:07Speaker 1: believe the creadle of humanity. And it starts there and
- 2:10Speaker 1: all you know, very slowly, there's like a it's time
- 2:13Speaker 1: elapse obviously, so the years go by like that, and
- 2:16Speaker 1: um uh, like the red dots start appearing very slowly,
- 2:21Speaker 1: start moving out of Africa, spreading to Asia, to Europe
- 2:24Speaker 1: all that, and then um it starts to to pop
- 2:27Speaker 1: up around North America and South America and then all
- 2:31Speaker 1: of a sudden you get to the I think like
- 2:33Speaker 1: the sixteenth century, maybe a little later, the Industrial Revolution,
- 2:38Speaker 1: and all of a sudden, this map just goes red
- 2:41Speaker 1: and it's really jarring. It really gets to point across
- 2:43Speaker 1: it like how quickly population has grown in the world
- 2:49Speaker 1: and the impacts of it. You know, that's why he
- 2:52Speaker 1: coupled this with carrying capacity, because it's like, well, yeah,
- 2:55Speaker 1: population and growth. Who cares? Then you say, oh, well,
- 2:58Speaker 1: there's a limit to the amount of resources we have, um.
- 3:03Speaker 1: And that limit is called the carrying capacity of Earth,
- 3:07Speaker 1: meaning how much Earth can sustain human life. And there's
- 3:11Speaker 1: supposedly a point to it, right, Yeah, I got some stats.
- 3:14Speaker 1: There's my intro here. Here's a couple of stats, Josh,
- 3:18Speaker 1: the United Nations population Division estimates. Because five babies are
- 3:23Speaker 1: born every second, and you're like crying all that poop,
- 3:31Speaker 1: the world is going to have seven billion people by
- 3:34Speaker 1: years in they think seven billion. Yeah, we're at six
- 3:37Speaker 1: point nine two and change right now, So I mean
- 3:40Speaker 1: we're close. And um to to illustrate your point there
- 3:43Speaker 1: about the red dots spreading like a disease, that is humans, um,
- 3:49Speaker 1: fewer than a billion people in eighteen hundred. Yeah, it
- 3:52Speaker 1: was like eight hundred million. Eight hundred dude. That mean
- 3:55Speaker 1: it seems like ancient history, but it ain't that long ago.
- 3:58Speaker 1: Three billion people in nineteen sixty and only six billion
- 4:01Speaker 1: people as recently as nine. Between nineteen fifty, chuck in nine,
- 4:07Speaker 1: the global population doubled from two point five billion to
- 4:11Speaker 1: five billion. That is cra azy. And behind this, that's
- 4:15Speaker 1: what they call exponential growth. It's not just adding like
- 4:20Speaker 1: a million people a year slow. Insteady, you're adding a
- 4:23Speaker 1: fixed number. It's you're adding you know, population is doubling
- 4:27Speaker 1: in forty years. That's exponential growth. And that is the
- 4:30Speaker 1: basis of what a guy named Thomas Robert Malthus uh In,
- 4:36Speaker 1: an eighteenth century English clergyman, predicted in his essay Um,
- 4:42Speaker 1: an essay on the principle of population, basically saying human
- 4:45Speaker 1: growth is exponential. We have a big problem because the
- 4:49Speaker 1: growth of food is not. It's linear. It's right, and
- 4:53Speaker 1: we're in trouble eventually. And he was fairly controversial at
- 4:57Speaker 1: the time. He was debated by a lot of people,
- 5:00Speaker 1: one of which was this dude named William Godwin, and
- 5:03Speaker 1: he had a theory called the perfectibility of society, which
- 5:06Speaker 1: is basically, you know, did we we're humans and we
- 5:09Speaker 1: no matter how much we grow, we will be able
- 5:11Speaker 1: to counter that with advances and technology to allow us
- 5:15Speaker 1: to grow. So they debated like crazy. Godwin subsequently was
- 5:19Speaker 1: one of the first proponents of anarchism, and Malthus talked
- 5:26Speaker 1: about eugenics way back then before it was eugenics. He said,
- 5:30Speaker 1: I could see something like this being possible, but he
- 5:32Speaker 1: said it's probably not something we should do. And he
- 5:35Speaker 1: also incidentally was the one of the first people to
- 5:40Speaker 1: uh to support or popularize the economic theory of rent.
- 5:45Speaker 1: Really yeah, well he was just all over the place,
- 5:48Speaker 1: wouldn't he. Well, but all kind of ties into population
- 5:51Speaker 1: because eugenics tied into it because he was talking about
- 5:53Speaker 1: controlling population and rent, he theorized, was only possible with
- 5:59Speaker 1: a surplus of re sources um, which allows you to
- 6:03Speaker 1: own a second place and rent it or rent a
- 6:06Speaker 1: tool or you know whatever people renting man. So what
- 6:10Speaker 1: Mauthis is talking about is generally classified as economics, right,
- 6:15Speaker 1: but it's also it stretches into all sorts of dirty,
- 6:19Speaker 1: nasty little areas like greed, um ecology, population control. So eugenics,
- 6:26Speaker 1: um family planning, abortion and fanticide, all sorts of stuff. Um.
- 6:31Speaker 1: That has a lot of implications, far reaching implications, right,
- 6:36Speaker 1: And so I didn't realize that there was somebody who
- 6:38Speaker 1: was a contemporary of him that argued, like, no humans
- 6:41Speaker 1: will use technology to outstrip, to outpace this mauth Mouthusian
- 6:46Speaker 1: curse is what it's called. Right, Yeah, that was more
- 6:48Speaker 1: than God when there was a few people too. I
- 6:49Speaker 1: didn't realize that it was at the time, but I
- 6:52Speaker 1: know that over the centuries people have been like mauth Is,
- 6:54Speaker 1: that was a great idea, but you really missed the mark.
- 6:57Speaker 1: And we're gonna use you as an example of how
- 7:00Speaker 1: badly somebody can can get it wrong, right, Because it
- 7:05Speaker 1: wasn't just technology. There's another aspect of it called the
- 7:08Speaker 1: demographic transition, which is basically as um as we get
- 7:13Speaker 1: better with this technology, one of the things we come
- 7:16Speaker 1: up with this birth control um and while we're while
- 7:21Speaker 1: our mortality rates are are lowering, so to our fertility rates,
- 7:27Speaker 1: and we eventually come to this thing called the replacement rate,
- 7:31Speaker 1: which is two point one children per household leads to
- 7:35Speaker 1: zero population growth, right, And I think they set in
- 7:39Speaker 1: Western Europe the number was one point four in the
- 7:43Speaker 1: late nineties. Like some people are afraid that that Mauthis
- 7:49Speaker 1: was correct at this point, and other people say that,
- 7:51Speaker 1: like in Europe and Asia they worry about the opposite
- 7:54Speaker 1: because you know, they have the problem over there that
- 7:55Speaker 1: they're not enough young people to take care of the
- 7:57Speaker 1: retirees one day. Exactly, it's negative population growth. So who's
- 8:02Speaker 1: right they do estimate? Um, who's who they is? I
- 8:05Speaker 1: don't know, but it just said researchers estimate that population
- 8:09Speaker 1: is not gonna level off until mid century at about
- 8:12Speaker 1: nine billion. Well that's at best. If that's if we
- 8:15Speaker 1: do level off, we could continue to keep going the
- 8:17Speaker 1: rate we're at now, the replacement rate that leads to
- 8:19Speaker 1: zero population growth, which is two point one right now,
- 8:22Speaker 1: we're at two point six worldwide and with Africa UM
- 8:26Speaker 1: skewing us the other way. Subsidaria in Africa has about
- 8:29Speaker 1: a five point one fertility rate, which means for every
- 8:33Speaker 1: household there's five point one children born. Does that point
- 8:36Speaker 1: one child? You always feels so bad for hus the
- 8:38Speaker 1: knee down, you know, on one leg um. But the uh,
- 8:43Speaker 1: if we can get to zero population growth, then we're
- 8:46Speaker 1: not going to really have to deal with the Mauthusian
- 8:48Speaker 1: curse possibly ever, but we're not. Then that's that's but
- 8:52Speaker 1: that's one thing that's um that mouth Is didn't account
- 8:55Speaker 1: for is things like as society has become more educated,
- 8:59Speaker 1: fertility rates tend to drop dramatically. So that's that's another
- 9:03Speaker 1: way to put it off too. So he was scoffed at,
- 9:05Speaker 1: Like you said, there's a lot of people out there
- 9:07Speaker 1: who think he he was he missed the mark. But um,
- 9:11Speaker 1: people have been doing a little bit of math lately
- 9:14Speaker 1: and have figured out that, Um, it's entirely possible that
- 9:17Speaker 1: he's right. That's somewhere down the line, He's right. Yeah,
- 9:20Speaker 1: And at the basis we should say of Mouths, his
- 9:23Speaker 1: whole thing is a lack of food and water really,
- 9:28Speaker 1: and we need air, food, water, shelter and all that stuff.
- 9:31Speaker 1: But what he was mainly centered on was eventually the
- 9:35Speaker 1: food growth will not match up with the population growth.
- 9:38Speaker 1: And a billion people go hungry every day already. So
- 9:42Speaker 1: so I might argue that that's already the case. So
- 9:44Speaker 1: let's talk about carrying capacity, chuck Um, if we had
- 9:49Speaker 1: not transitioned, which we have, which kind of proves the
- 9:52Speaker 1: UM positive positivists camp Um that we can be technological.
- 9:59Speaker 1: If we hadn't transition from hunter gatherer to agriculture UM,
- 10:03Speaker 1: the care and capacity of Earth would have been reached
- 10:05Speaker 1: at about a hundred million people. Yes, because there's just
- 10:09Speaker 1: so many animals running around that we can kill. There's
- 10:12Speaker 1: only so many berries that are going to occur naturally
- 10:14Speaker 1: on the on the vine. Right. But we did transition
- 10:19Speaker 1: to agriculture UM before we hit the hundred million mark,
- 10:23Speaker 1: possibly maybe not UM farming, and we we began to
- 10:28Speaker 1: use technology which is growing crops to feed ourselves. And
- 10:34Speaker 1: then we reached another point right UM where we hit
- 10:38Speaker 1: what was called the green revolution, remember that UM, where
- 10:44Speaker 1: there was a lot of people who were saying about
- 10:46Speaker 1: a billion people are going to die because we are
- 10:49Speaker 1: no longer We're not going to be able to provide
- 10:52Speaker 1: food for all the people here. Um. We've we've come
- 10:55Speaker 1: up with great vaccines and all this other technology that's
- 10:58Speaker 1: lowering the mortality rate. But that just means people are
- 11:02Speaker 1: living longer and they need food longer over the over
- 11:04Speaker 1: their lifespan. Right, So what are we gonna do? Norman
- 11:08Speaker 1: Borlog comes along and says, you know what we're gonna
- 11:10Speaker 1: doing exactly tapioca pudding for everybody and a care bear
- 11:16Speaker 1: in every garage. No, they go ahead with what he
- 11:18Speaker 1: said because he was a genius. He said, we're gonna
- 11:20Speaker 1: maximize the yield that we get out of arable land.
- 11:23Speaker 1: We're not just gonna plant some seeds and be like,
- 11:25Speaker 1: hope you grow. We're going to apply tons of pesticide,
- 11:29Speaker 1: tons of fertilizer, and we're going to squeeze corn the
- 11:34Speaker 1: size of your torso out of every every plant. Right, Yeah,
- 11:38Speaker 1: he wasn't some like awful mad That sound makes him
- 11:41Speaker 1: sound like some awful mad scientists, though in the eyes
- 11:44Speaker 1: of a lot of environmentalists he he well, I mean
- 11:47Speaker 1: think about all the runoff, all the soil depletion. Also,
- 11:51Speaker 1: didn't he also want a Nobel Prize? Sure? Yeah, he's
- 11:54Speaker 1: credited with saving that billion people that were predicted to
- 11:57Speaker 1: starve because he came in just in time because Earth
- 12:00Speaker 1: would have reached this carrying capacity for agriculture. So we've
- 12:03Speaker 1: had at least two different events where we were able
- 12:07Speaker 1: to leap forward through technology and avoid the Malthusian curse. Right, Yes,
- 12:11Speaker 1: So there are people out there who say, well, you know,
- 12:14Speaker 1: we're we're we're going to avoid it again, but what
- 12:16Speaker 1: will that be? Sure and come up with another one.
- 12:19Speaker 1: So I'm sorry, chok, we would have hit the carrying
- 12:22Speaker 1: capacity a hundred million where we hunter gatherers? Right? What
- 12:25Speaker 1: are the predictions now? Well, they say, and this is
- 12:28Speaker 1: where what I think is really interesting and completely sad,
- 12:31Speaker 1: is that we have a potential caring capacity of two
- 12:35Speaker 1: billion to forty billion, clearly past the two So one
- 12:39Speaker 1: might ask, how can it be that big of a range,
- 12:42Speaker 1: And the answer is lifestyle. And here's a very sad
- 12:46Speaker 1: sat If the entire earth live like middle class Americans,
- 12:50Speaker 1: not the super rich, who you know, probably consume more
- 12:53Speaker 1: energy and the like than your average human, just regular
- 12:56Speaker 1: middle class American folks consume about three point three times
- 13:02Speaker 1: the subsistence level of food and two hundred and fifty
- 13:05Speaker 1: times the subsistence level of water clean water. And that
- 13:09Speaker 1: means the Earth if we if everyone was like us,
- 13:12Speaker 1: the Earth could only support about two billion people. So
- 13:15Speaker 1: what's going on is of the Earth is consuming I
- 13:19Speaker 1: don't have the percentage, but the other seventy percent of
- 13:22Speaker 1: the Earth is left with what's left, which is really
- 13:25Speaker 1: really it's just a it's a uh disparity in the
- 13:30Speaker 1: allocation of resources and that's consumed. So that's why it
- 13:34Speaker 1: can be a range of two billion to forty billion
- 13:36Speaker 1: because of the different lifestyles. If if everyone lived like
- 13:39Speaker 1: there would be plenty for everyone and no one would
- 13:41Speaker 1: be starving. No, if everybody lived like we would all
- 13:46Speaker 1: we would be like sorry, well the um Yeah, that's
- 13:51Speaker 1: that's where the forty billion number comes in. I've seen
- 13:53Speaker 1: thirty and I've seen forty on the high end for
- 13:55Speaker 1: the carrying capacity, and that's where every square inch of
- 13:58Speaker 1: arable land is being cultivated to its maximum yield, and
- 14:01Speaker 1: all people live in high rises that are as high
- 14:04Speaker 1: as we can build them right now, right um, And
- 14:06Speaker 1: we're mining UM asteroids for uh, for UM minerals and
- 14:13Speaker 1: all that. We're not we're no longer going we're no
- 14:16Speaker 1: longer going to the Earth. We're going into outer space. Possibly.
- 14:21Speaker 1: I don't think that that shouldn't have started about fifty
- 14:23Speaker 1: years ago, right um. But the that forty billion prediction
- 14:28Speaker 1: is um based on the absolute minimum requirements, and everybody,
- 14:32Speaker 1: forty billion people living on the planet UM all using
- 14:36Speaker 1: the minimum amount, which is four liters of water a
- 14:39Speaker 1: year and about three ms of food a year, mostly grains,
- 14:45Speaker 1: and you can basically kiss meat goodbye because we need
- 14:48Speaker 1: that land to grow our grains rather than grow grains
- 14:51Speaker 1: to feed cows, which is another way that the West
- 14:54Speaker 1: consumes resources more than more than its fair share through
- 14:58Speaker 1: a meat rich diet, which just you're not only eating
- 15:01Speaker 1: the meat, you're eating the grains that the meat ate. Right,
- 15:05Speaker 1: So chuck, and let me ask you something. If you
- 15:12Speaker 1: had if you went home and turned on your tap
- 15:14Speaker 1: and there was hot water and it was flowing, and
- 15:17Speaker 1: it was as much as you liked, right, would you
- 15:20Speaker 1: care how you were getting that? What do you mean
- 15:24Speaker 1: how it was being delivered through my faucet? Yes? Uh?
- 15:28Speaker 1: Is this the trict question? No, it's not. Let me rephrase.
- 15:31Speaker 1: If you went home and turned on your hot water
- 15:35Speaker 1: and there's as much hot water as you wanted, and
- 15:38Speaker 1: it was you knew it was coming from a sustainable source,
- 15:40Speaker 1: would you care if it was sustainable? Yeah? I guess not.
- 15:44Speaker 1: But I'm kind of like a water saver. So your
- 15:48Speaker 1: water saver. What if you knew you didn't really have
- 15:51Speaker 1: to save water because it was so sustainable, you wouldn't care.
- 15:55Speaker 1: No one cares as long as we have the luxuries
- 15:58Speaker 1: that were afforded. It does, and you don't care if
- 16:01Speaker 1: it came from burning banana appeals, No one cares. The
- 16:05Speaker 1: problem is that the problem with the course that we're
- 16:08Speaker 1: on apparently right now, is that we are um using
- 16:13Speaker 1: technology not to get more from less, but to get
- 16:18Speaker 1: more from more, more cheaply. Right. Yeah, it's um it's
- 16:23Speaker 1: a uniquely human thing they call it in the article,
- 16:25Speaker 1: which is pretty much true. But technological advancement is in
- 16:30Speaker 1: many ways leading to our habitat destruction. Ideally, at this
- 16:33Speaker 1: point everyone would be on solar and the massive companies
- 16:38Speaker 1: would be solar powered and all that kind of thing.
- 16:41Speaker 1: And that's another great point is you know, you don't
- 16:44Speaker 1: care where your electricity comes from. Do you care if
- 16:46Speaker 1: it comes from a solar panel or wind? No, of
- 16:50Speaker 1: course you don't. You just want your electricity. So if
- 16:53Speaker 1: we had invested, or if we could invest our technological
- 16:57Speaker 1: advances into um get what we have now from less
- 17:02Speaker 1: from solar radiation or wind power, then we would be
- 17:08Speaker 1: that that's true cutting edge technology, rather than you know,
- 17:11Speaker 1: figuring out ways to deplete things faster, more cheaply, which
- 17:15Speaker 1: is the way we're going. Yeah, like thinking of let's
- 17:18Speaker 1: say a more efficient oil driller or a more efficient
- 17:23Speaker 1: way of getting coal from a mountain, i e. Mountaintop removal.
- 17:27Speaker 1: So they're using technology, but they're using in ways that
- 17:30Speaker 1: are also destroying the habitat. And sustainability is all about
- 17:34Speaker 1: finding the right balance in your habitat. So here's here's
- 17:37Speaker 1: the conclusion I came to from reading this right the
- 17:40Speaker 1: argument from the positivists camp. I don't even think I'm
- 17:45Speaker 1: using that word correctly. But um, the people who are
- 17:48Speaker 1: the optimists camp, sure duh, right are Um they're saying, no,
- 17:54Speaker 1: mouth has was incorrect because he failed to account for
- 17:58Speaker 1: human ingenuity. And as population grows, so to do the
- 18:03Speaker 1: number of geniuses, and that's where innovation comes from. Right, Um.
- 18:09Speaker 1: The I think the the optimists are missing a point
- 18:15Speaker 1: in their model, and that is greed. You can't really
- 18:19Speaker 1: sway greed to to benefit human ecology, can you know?
- 18:27Speaker 1: And you can't convince an entire population of people to
- 18:30Speaker 1: change their lifestyles, which is what it would take. That's
- 18:33Speaker 1: what I'm saying you you can't because they don't care.
- 18:37Speaker 1: But if you could deliver them that same amount of
- 18:40Speaker 1: hot water, that same electricity, and it was coming from
- 18:44Speaker 1: a sustainable source. No one's going to fight that, right.
- 18:47Speaker 1: It's having to get them to fight that fight to
- 18:50Speaker 1: get the people who are controlling it to change over.
- 18:53Speaker 1: They're not going to do that. So there's that fatal
- 18:56Speaker 1: flaw in that model that the gloom and doom camp
- 18:59Speaker 1: has over the UM optimist camp, and that they don't
- 19:03Speaker 1: account for for greed. Have you ever seen who killed
- 19:06Speaker 1: the electric car? No? I never did. I encourage people
- 19:09Speaker 1: to see that. That's pretty scary. The e V one was.
- 19:12Speaker 1: I mean, I don't know if you remember, but the
- 19:14Speaker 1: e V one was. It was ready to go. There
- 19:17Speaker 1: were TV commercials you can look up EV one commercial
- 19:19Speaker 1: on YouTube and they were running them on television. Electric
- 19:23Speaker 1: electric cars are here, They're not coming, they are here,
- 19:26Speaker 1: and boom it was gone. Yeah, I'll check it out
- 19:31Speaker 1: and I'll give you a few guesses as to why
- 19:32Speaker 1: it left so quickly. And not only were they gone, dude,
- 19:36Speaker 1: they literally gathered them all up and crushed them many time. Exactly. Yeah, sad,
- 19:47Speaker 1: but go go rented. It's cool. Yeah, and um powerful
- 19:50Speaker 1: lobbies out there. What else you got? I got nothing, man.
- 19:53Speaker 1: This is this is a good one to chew on
- 19:54Speaker 1: for people. I think I think so too. We just
- 19:56Speaker 1: encourage people like we always do, just to you know,
- 20:00Speaker 1: we're not saying, you know, quit your job and go
- 20:02Speaker 1: like build solar panels for a living and live on
- 20:04Speaker 1: a on a wind farm. You can do that, that'd
- 20:06Speaker 1: be awesome. But little little things, little positive steps, they've
- 20:09Speaker 1: say a little water, say a little power. I disagree, man,
- 20:11Speaker 1: what I don't think the onus is on the people.
- 20:14Speaker 1: I think the onus is on the the people who
- 20:18Speaker 1: are misdirecting technological advancement. I'd say it's on bothagree you
- 20:26Speaker 1: don't think that this is on the people to conserve
- 20:29Speaker 1: I think I think it. I think it is. I
- 20:32Speaker 1: think we've put it on the people, but I don't
- 20:34Speaker 1: think it's going to make enough of an impact. All right,
- 20:39Speaker 1: I think it's on the policy makers. That's who I
- 20:41Speaker 1: think it's on. I would I think I think it's
- 20:43Speaker 1: on both. Um. Okay, well that's a debate to be
- 20:46Speaker 1: played out on the Facebook page if you ask me, right, yeah, man,
- 20:49Speaker 1: we should set a form um. So if you want
- 20:52Speaker 1: to learn more, type and has the Earth reached its
- 20:54Speaker 1: carrying capacity? Or Thomas Malthus M A L T h
- 20:58Speaker 1: U s in this search part how stuff works dot Com.
- 21:01Speaker 1: It will bring up some pretty cool stuff. Well, then
- 21:04Speaker 1: that means it's time for listener mail. All right, Josh,
- 21:07Speaker 1: I'm gonna call this, uh, how to make a my
- 21:10Speaker 1: teenage son listen to your show from Portland, Oregon. Hi,
- 21:15Speaker 1: guys and Jerry. When you have a teenager, you will
- 21:18Speaker 1: quickly learn that you can't just tell them what to
- 21:20Speaker 1: do and expect them to do it. I remember those days.
- 21:23Speaker 1: It's so frustrating because as a parent, you know that
- 21:26Speaker 1: your kid will love something and get lots out of it,
- 21:28Speaker 1: but you can't come right out and say it, or
- 21:30Speaker 1: they will never ever try the thing you told them
- 21:32Speaker 1: to try. For example, your podcast. I knew for a fact,
- 21:36Speaker 1: like I know that it will reign in Portland, that
- 21:38Speaker 1: my thirteen year old son Ethan would really love stuff.
- 21:41Speaker 1: You should know because I love the podcast. I've turned
- 21:43Speaker 1: other people onto it and they love it. But I
- 21:45Speaker 1: knew I had to be sneaky in order for my
- 21:47Speaker 1: son to give it a try. Ethan is a fencer
- 21:51Speaker 1: and at the time was also working on a research
- 21:53Speaker 1: project about Renaissance jousting and tournaments. So one Saturday I
- 21:57Speaker 1: was working in the kitchen. I played how nights were
- 22:00Speaker 1: Uh to catch his interest. Every time he came in
- 22:02Speaker 1: the kitchen, I'd hit play. When he leave, I'd hit pause.
- 22:08Speaker 1: I would figure he would just think, Man, these guys
- 22:09Speaker 1: take a long time to finish the center. He would
- 22:12Speaker 1: hang around the kitchen longer and longer each time, and
- 22:14Speaker 1: I could tell I almost had him on the line
- 22:16Speaker 1: like I was noodling. Although you would say I had
- 22:19Speaker 1: him on the arm. Yeah, there's no mine. When it
- 22:22Speaker 1: was over, he said he already knew everything you talked
- 22:24Speaker 1: about in the podcast, but I could tell he was intrigued.
- 22:27Speaker 1: Then I hit him with the Scooby Doo Show and
- 22:29Speaker 1: that was it. You had another fan. Now he has
- 22:31Speaker 1: downloaded the app for his iPod and listens each night
- 22:34Speaker 1: as he's going to sleep. And that tent, Yeah, that's
- 22:38Speaker 1: from Afton in a very sneaky mom thank you in Portland, Oregon.
- 22:43Speaker 1: That also kind of ties into the Colts and Brainwashing
- 22:46Speaker 1: episodes two, didn't it? Yeah? And she said um. When
- 22:50Speaker 1: she replied, I asked her if I could read this.
- 22:51Speaker 1: She said sure, And she said, I guess he'll know
- 22:54Speaker 1: my little trick now, but he'll get such a kick
- 22:57Speaker 1: out of being mentioned Ethan the fencer, he will forget
- 22:59Speaker 1: the yeah, and at least he can rest assured that
- 23:03Speaker 1: she's not like putting anything in his soup to get
- 23:06Speaker 1: him to do what she wants. She uses more subtle
- 23:08Speaker 1: tactics than that. Right. I wish you could put something
- 23:11Speaker 1: in soup to make people listen to this. I'd be
- 23:14Speaker 1: putting it in soup. Yeah, that's a good idea. I
- 23:17Speaker 1: put it in all soups. I'll tell you what, if
- 23:19Speaker 1: you have any suggestions of what we can put in
- 23:21Speaker 1: people's soup to get them to listen to stuff you
- 23:23Speaker 1: should know and to get them to go give us
- 23:25Speaker 1: a review on iTunes. Huh, yeah, that that helps us out.
- 23:29Speaker 1: When you do that, Uh, you should send us an
- 23:32Speaker 1: email and you should send it to a specific email dress.
- 23:37Speaker 1: That is stuff Podcast at how stuff works dot com.
- 23:46Speaker 1: Be sure to check out our new video podcast, Stuff
- 23:48Speaker 1: from the Future. Join how Stuff Work staff as we
- 23:51Speaker 1: explore the most promising and perplexing possibilities of tomorrow. Brought
- 23:58Speaker 1: to you by the reinvented two thousand twelve Camery. It's ready,
- 24:01Speaker 1: are you