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Why Rome actually fell: plagues, slavery, & ice age — Kyle Harper

24 Apr 2025 22 published claims 2 attributable people

Speakers in the public record

Claim mix

belief 8evaluation 7uncertainty 2preference 2commitment 1prediction 1recommendation 1

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Claim ledger

The useful parts, with receipts.

22 published records

01 / evaluation

If anything, the demand is equally or perhaps even more important because if there's not a mechanism, if there's not institutions that let you turn this kind of exploitation into cash flow, the institution's not gonna go very far.

“If anything, the demand is equally or perhaps even more important because if there's not a mechanism, if there's not institutions that let you turn this kind of exploitation into cash flow, the institution's not gonna go very far.”
Speaker
Kyle Harper
Publisher
Dwarkesh Podcast

02 / evaluation

In fact, it obscures the importance of modern slavery because modern slavery is uniquely important and it's uniquely tied up with certain kinds of market exchange and certain kinds of production, certain kinds of racial ideologies.

“In fact, it obscures the importance of modern slavery because modern slavery is uniquely important and it's uniquely tied up with certain kinds of market exchange and certain kinds of production, certain kinds of racial ideologies.”
Speaker
Kyle Harper
Publisher
Dwarkesh Podcast

03 / belief

I think there's no doubt that pre-industrial populations, and again, populations—so you still have your Isaac Newtons, who whatever infected him as a kid, didn't slow him down—but at the population level, I think there's no doubt that not only were pre-industrial populations shorter, this is just a total fact that we know from their bones, but they probably also, on average, had a lower distribution of cognitive abilities.

“I think there's no doubt that pre-industrial populations, and again, populations—so you still have your Isaac Newtons, who whatever infected him as a kid, didn't slow him down—but at the population level, I think there's no doubt that not only were pre-industrial populations shorter, this is just a total fact that we know from their bones, but they probably also, on average, had a lower distribution of cognitive abilities.”
Speaker
Kyle Harper
Publisher
Dwarkesh Podcast

04 / belief

I think that's an excellent note to close on. Just to plug one more time, we've been discussing Plagues Upon the Earth, which is the history of disease going back through the Neolithic to modern times, Fate of Rome which discusses the plagues and history of the Roman Empire considering climate and biology.

“I think that's an excellent note to close on. Just to plug one more time, we've been discussing Plagues Upon the Earth, which is the history of disease going back through the Neolithic to modern times, Fate of Rome which discusses the plagues and history of the Roman Empire considering climate and biology.”
Speaker
Dwarkesh Patel
Publisher
Dwarkesh Podcast

14 / evaluation

I mean, first thing, it's important, I think you were starting to get at this, that there's never a generation of humans that has the opportunity to make this choice once and for all, like, should we stay hunting mammoths or should we become sedentary farmers with basically torturous dentistry and die by diarrhea?

“I mean, first thing, it's important, I think you were starting to get at this, that there's never a generation of humans that has the opportunity to make this choice once and for all, like, should we stay hunting mammoths or should we become sedentary farmers with basically torturous dentistry and die by diarrhea?”
Speaker
Kyle Harper
Publisher
Dwarkesh Podcast

15 / evaluation

The reason I wanted to have you on is because I don't think I've encountered that many other authors who can connect biology, economics, history, and climate into explaining some of the big things that have happened through human history in the way you can.

“The reason I wanted to have you on is because I don't think I've encountered that many other authors who can connect biology, economics, history, and climate into explaining some of the big things that have happened through human history in the way you can.”
Speaker
Dwarkesh Patel
Publisher
Dwarkesh Podcast

18 / evaluation

In the case of the plague, if you were really knowledgeable about the basics of ecology and evolution of disease, you would never be like, "I think that every now and then a rodent disease from Central Asia is gonna wipe out half of the continent".

“In the case of the plague, if you were really knowledgeable about the basics of ecology and evolution of disease, you would never be like, "I think that every now and then a rodent disease from Central Asia is gonna wipe out half of the continent".”
Speaker
Kyle Harper
Publisher
Dwarkesh Podcast

19 / commitment

Because we need to understand how the earth system works, how the climate system works in order to be able to model what's happening, we need an empirical record of what the climate has done.

“Because we need to understand how the earth system works, how the climate system works in order to be able to model what's happening, we need an empirical record of what the climate has done.”
Speaker
Kyle Harper
Publisher
Dwarkesh Podcast

20 / evaluation

I love Pliny the Elder's encyclopedia, but if you look in the big picture, the contribution that the Roman Empire makes to our knowledge of how nature works and then the applied technology that comes out of that is really pathetic for five, 600 years.

“I love Pliny the Elder's encyclopedia, but if you look in the big picture, the contribution that the Roman Empire makes to our knowledge of how nature works and then the applied technology that comes out of that is really pathetic for five, 600 years.”
Speaker
Kyle Harper
Publisher
Dwarkesh Podcast

21 / prediction

I think the actual fertility for foragers is sort of like reasonable—I don’t know if sustainable is the right word because I don’t mean in an ecological sense but more so—it keeps your population constant.

“I think the actual fertility for foragers is sort of like reasonable—I don’t know if sustainable is the right word because I don’t mean in an ecological sense but more so—it keeps your population constant.”
Speaker
Dwarkesh Patel
Publisher
Dwarkesh Podcast

22 / recommendation

The example I use in the book is the very famous diary of Samuel Pepys, who's this incredible figure and is very close to Newton and that social group and his name is on the first edition of the Principia.

“The example I use in the book is the very famous diary of Samuel Pepys, who's this incredible figure and is very close to Newton and that social group and his name is on the first edition of the Principia.”
Speaker
Kyle Harper
Publisher
Dwarkesh Podcast
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