Did the fire at the Library of Alexandria set humanity back?

The Library of Alexandria

0:00Hey, it's Ira, and you're listening to Science Friday. In 48 BC, a massive fire ripped through the Library of Alexandria, one of the largest and most significant ancient libraries. It's estimated around 100,000 works of literature were lost, a staggering number. It's hard not to get a little sad at the scale of the great works that no longer exist. Well, throughout history, you know, there are lots of examples of things being lost. You've got lost cities

0:32like Pompeii, lost graves of figures like Genghis Khan, lost works of art from masters like da Vinci. And with each loss is a little bit of hope that someday, somehow, they'll be found again. My next guest has been on a quest to document the parts of history that have been lost so we can remember them once more. Sam Keen, author of the Museum of Lost Things. Welcome to Science Friday. Hello, thanks for having me. Nice to have you back. All right, let's go back to 48 BC. Do we know what it would have been like to walk through

1:05the Library of Alexandria? Yeah, it would have been a lot like walking through the stacks of a modern college library or something like that. I think nowadays we think about libraries as having big open spaces, you know, people sitting around tables, maybe collaborating a little bit. These were much more compact and a lot of scrolls jammed into a small place and probably not very well organized. You kind of had to know the gatekeeper librarian pretty well. You might not be able to find anything, but the amount of knowledge they had in there was probably one of

1:37the most comprehensive, if not the most comprehensive, in terms of just the percentage they had of all the known knowledge in the world at the time. So you're talking about Greek, Roman, scientists, philosophers, things like that? Yeah, and going all the way out to, you know, the Middle East, going to Persia, even a little bit from places like China. They had a really wide array they were looking for. They wanted to make it as universal as they possibly could. And of course, so many of these items were made on papyrus, which is so fragile, right? I mean, they would have gone up in flame easily.

2:09Yes, they would have gone up very easily, yeah. And they had to copy them over and over too, which, you know, could introduce errors and things like that. And there were full-time jobs of people who just had to copy these scrolls because they would fall apart. How much of any of that actually survived? We have very, very little, just scraps of one papyrus scroll is the only thing we know that was in the original Library of Alexandria because it's a list of documents that they had at the library. So there was no reason to have that anywhere else. Some of the things they had,

2:44you know, from the Iliad, the Odyssey, other Greek myths, Aristotle, Plato, have survived in other forms. But we only have one scrap that we know was in the library. Yet with all this talk about a fire, you raise questions in your book about whether there really ever was a fire. Why is that? Yeah, there definitely was a fire there in 48 BC when Julius Caesar was down there fighting a war. We know there was a fire around there. But there are stray references to the library and the attached museum after that point. We don't know if they maybe rebuilt it. There was also an

3:18annex. So perhaps they had some things in the annex. And, you know, we just don't know what exactly happened to all the knowledge there. I think kind of a sadder situation would be one theory is that just over time, as the Roman Empire sort of crumbled, people just neglected the library and let these things die through just simple neglect, not copying them anymore, letting them go to waste, things like that. Yeah. Now, we talked now about the Library of Alexandria losing lots of stuff. But this actually

3:49happened at the Library of Congress, did it not? A fire there? There have been multiple fires there, yes, over the years. They had pretty poor fire prevention practices, I will say that, for a lot of its history. And we did lose some very important things. A lot of the original documents, you know, things that Thomas Jefferson had donated, things like that, have been lost in these fires. Is there any chance for both of these cases that somewhere some of these lost things may be recovered? It's always possible. They have found papyrus scrolls on mummies and things like that. They

4:26would use them to wrap the mummies, or they might, you know, write an incantation on one side of a piece of papyrus that they didn't want to use anymore. And on the backside, there might be something interesting that they could read or find out, or maybe between layers or something like that. And especially with new technologies coming out, infrared technologies, AI systems, where they are able to read, even when they've been burned or written over. Sometimes you can extract the text from beneath it. So yeah, there's always a possibility, especially

4:57with the ancient stuff, that we could find something someday. So did this loss, the Library of Alexandria, set us back in the human journey of knowledge? How really important was this? I think it was pretty significant, because if you look back at it, there are documents, we still have some of them, but they were building things like steam engines way back in the BCs. And if you think about that, we didn't get to that point again until something like the 1700s. So that's a long, long time where technology maybe not stagnated, but it really didn't progress as fast

5:33as it might have. Had we had this knowledge and been able to spread it, and had we not had the collapse, it sort of arrested a lot of the development. So you can talk about that, and also devices like the Antikythera mechanism, which is another one I talk about in the book.

The Antikythera Mechanism

5:46Let's go right into that. Tell us about that. Essentially, it's the world's first computer. It was from the BCs. We don't know exactly when, but maybe first century BC or so. And it was not an electronic computer, obviously. It was mechanical. But they used it to calculate astronomical phenomenon. So eclipses were one example. You could set a date, and it would tell you what was going on in the heavens at that point. You could set it to an eclipse. It would tell you what date it was going to happen. And it's pretty amazing to think

6:17that they had these devices, essentially computers, thousands and thousands of years ago. And we didn't know about another device like this. In fact, we didn't know about another gear, even, that they had in ancient times, until some sponge divers off the coast of an island in Greece happened to find this mechanism, all rusted and corroded over, among a shipwreck, among some statues and things like that. But if they had not stumbled into it, we would have no idea that they had computers

6:50back then. And it really, I guess that's kind of the motivation for me writing the book, was how fragile a lot of this information and this knowledge is about what we know about the past and all of what we've lost. Sam, do we have any idea what it was used for? We have a general idea of what it was used for. Basically, they were trying to predict astrological phenomenon. So eclipses, where the planets would be at certain times of the year, so you could cast horoscopes, things like that.

7:21And how much serendipity is involved in this? Because didn't they almost just throw that thing overboard and thought it was a piece of junk? Yeah, they were pulling up a lot of stuff from the bottom. Some of it just looked like boulders. And they said, well, that's no good. Let's toss it over. And they were about to toss it over until someone looked a little closer, saw what looked like metal, maybe some corrosion there. And they said, well, why don't we hold on to this one a little longer? And eventually it split open. It cracked after it dried out and was just lying there in the museum when the director's cousin walked through, noticed some gears and said, we should take a

7:56closer look at this. And eventually that's how they figured out that it was one of the most important pieces, if not the most important, that we've salvaged from ancient times. Very, very cool. And did we know before this that ancient Greeks used computers? We had no idea. We did not know even that they had gears or anything like that. This was really, really something that we had no idea existed. And it tells you a little bit more as well, because it's not like someone just sat down one day and invented this thing out of nothing,

8:26just like someone wouldn't sit down and invent an iPhone out of nothing. There were a lot of precursors to it. That's just the way technology works. So it tells us a lot about the development of it. And it's a little scary in some ways to think of how much we might have missed had this device not turned up. It was hand cranked, right? I mean, yeah, it had a little dial on the side and you could wheel it forward, wheel it around. If you want to picture it, essentially the front had dials. So imagine a clock face with more than three hands on it, something like seven or eight hands,

8:57one for the sun, one for Venus, Mercury, the moon, and you would turn the crank on the side and these dials would spin around and around the outside was essentially the zodiac signs. So you could tell where it was in the heavens, in the sky at any one point in the year. But this was still at a time when we believed the galaxy, as we speak, was geocentric, that our solar system revolved around the Earth, right? A lot of people did, yeah. Actually, going back to the Library of Alexandria, there were some people there who proposed a heliocentric solar system at the time. Knowledge maybe hadn't spread all that far,

9:32but the idea was a bit out there. With this one, though, I think it's even more remarkable that they were able to figure out all of the elaborate gearing based on a notion that was false, that the Earth was the center of the solar system. It makes it even more impressive in some ways. You know, reading this book reminded me of an event that was unexplainable to me at the time. I want to tell you about this. I was visiting the ancient ruins of Topram next to Angkor Wat in Cambodia. And a tour guide knew that I was a science guy. He drew me away to show me something outstanding

10:05and astounding, a picture of what certainly looked like a stegosaurus etched into the 12th century temple. I mean, is it possible? I mean, this really does look like a stegosaurus, that there were ancient archaeologists and that knowledge was lost? Well, it was something it reminds me of. I talk in the book about the Peking man fossils, which are probably the most famous lost fossils in history. It was a group of not just men, but men, women and children that were discovered in China in about, you know, the 1910s, 1920s.

10:39And at the time, there were locals there who called them dragon bones. And in fact, the place they found Peking man, the bones there was called Dragon Bone Hill. So people back then definitely knew that these were the bones of some sort of animal. And, you know, I don't think it's implausible that they might have thought that these animals existed in the past. I don't know a lot of details about what they believed, but I know that in Western culture, at least, a lot of people for a long time believe that animals simply did not go extinct,

11:12that no species had ever gone extinct. They might've had beliefs that these animals existed at one point. And it's not implausible to me that they would have looked at or found something like a stegosaurus and, you know, put something up on a wall. Who knows exactly what they were thinking or what they thought about it. But I don't think it's implausible that they would have found these bones and decided to put something up on a wall. You know, that brings me to the point that we think about technology as being a modern concept. Perhaps we need to reframe our view on this. What do you think?

11:45Yeah. And writing this book really made me think of, again, how precious knowledge is and the fact that technologies, it's not a, we think about it kind of as a linear progression nowadays and it's building and it will always keep expanding. But there have been more expansions and contractions of not just technology, but knowledge, basic knowledge in history as well. So it's a much more circular and non-linear process than I would have imagined before I started writing the book.

History of Lost Knowledge

12:12So what's your big takeaway in writing this book? It really makes me cautious interpreting history just because you have to worry about what you're not seeing. And I think archaeologists are doing a very, a better job nowadays of looking at context, you know, gathering little bits of pollen and things from the soil to help us understand what we're not seeing or what we were ignoring before. But it really does make you cautious in interpreting information. But it also makes me kind of marvel at all we've been able to hold on to,

12:44because in a lot of cases, things survived wars, natural disasters, you know, the rise and fall of empires just sitting in someone's attic or, you know, tucked away somewhere. And there is a historian I talk about in the book. He said, you know, we can certainly mourn the loss of something like the Library of Alexandria. But in some ways, that's not a great way to preserve knowledge, to have a central storehouse, because those are often in places of great wealth, great power, which also makes them targets for invading armies and things like that. So it's kind of putting all

13:18your eggs in one basket, that situation. Whereas if you spread the information out, it's much more likely that something will survive somewhere. And that's really borne out if you look at the historical record. Well, Sam, as somebody who loves history, I really love this book. Thank you for taking time to be with us today. Well, thanks for having me. Sam Kean is the author of the Museum of Lost Things. Check it out. This episode was produced by Kathleen Davis. And if you've got a favorite lost thing you want to tell us about, give us a call. 877-4-SI-FRI. 877-4-SI-FRI. We'll catch you next time. I'm Ira Flato.

13:58Thank you.