8 ms·

Think everyone died young in ancient societies? Think again

100 points by diodorus 8y ago

simonebrunozzi 8y ago
Most important difference: life expectancy at birth, vs life expectancy as an adult.
- olliej 8y ago
  Yup this is another article going “we aren’t living longer we’ve just stopped <5 years olds dying as often”
  - 0xcde4c3db 8y ago
    Incidentally, life expectancy at 65 in multiple countries has been slowly creeping up over the past ~50 years, perhaps longer. Last I heard, nobody really had a good explanation as to why.
    - ENGNR 8y ago
      I like to think it's the slow death of the concept of retirement Work is purpose so long as it's engaging, and people with purpose do things to keep themselves going
      - laumars 8y ago
        I'm yet to meet anyone retired who says "I wish I was still working". Quite the opposite in fact.
        deleted 8y ago
        [deleted]
        alsetmusic 8y ago
        > I'm yet to meet anyone retired who says "I wish I was still working". Quite the opposite in fact. My brother and I both shared a fear that our father would waste away and die after retirement (he is extremely driven). It turned out that he “never has enough time” for all the projects he creates for himself post-retirement. He wrote a book, researches the family tree, travels, etc. It was surprising how much he wants, and finds ways to, remain active. I don’t think we were wrong to expect him to need an outlet. We simply did not anticipate that he would create his own.
      - olliej 8y ago
        Also politicians continue to push back the official retirement age, and so people literally cannot afford to retire. Note of course that this retirement age is not the official retirement age for senators and congressonal reps in America. The oldest retirement age for senators in the US is 62. Alternatively anything over 50 if you’ve served more than 20 years. Or any time at all once you’ve worked 25 years. Of course they’ve also ensured retirement for them is retirement with full pay. I’d love to get to retire with full pay after 25 years.
    - toomanybeersies 8y ago
      Improved medicine would probably be why. My grandfather lived for another 5 years than he probably would've without modern medicine. I don't know if they would've been able to operate on him in the 60's like they can in modern times.
      - kakwa_ 8y ago
        Medicine, not that much actually, I think most of the progress we have seen comes from food security and the sanitary movement. With those 2 items, you can basically get to a life expectancy of 70 years in most places, then you add modern medicine, and you go up another 10 years or so.
    - danieltillett 8y ago
      I think there are fewer people worn out by hard physical work. I look at how fast people who do hard physical work age compared to those of us who sit around in offices and it is scary.
    - 8bitsrule 8y ago
      I like to lay that largely on work environments. Physical labor and physical stress, long hours, wear and tear on body parts, more likelihood of disabling injuries & inflammation. Throw in better knowledge of good nutrition (less consumption of toxins) and the importance of exercise - inactivity is a slow killer. Finally, psychology ... more to live for, and the means to enjoy it.
    - notahacker 8y ago
      Doesn't seem surprising really. 65+ people are vulnerable to a lot of the same diseases which used to kill off infants, so increased access to sanitation, basic medical care and antibiotics is going to do a lot in developing countries, whilst survival rates for people with cancers and other degenerative conditions, victims of strokes and heart attacks etc have improved enormously for those with access to increasingly effective treatment.
  - everdev 8y ago
    Another idea might be that modern medicine is in fact extending life, but other modern things like cars, cigarettes, junk food, etc. are simultaneously decreasing life span. So, I bet if you introduced modern medicine as the only change to an agrarian society you'd see an increase in life expectancy.
- ItsMe000001 8y ago
  And women. Giving birth used to be very risky business. In this lecture "Return of the Microbes" the professor of medicine mentions in passing that in Victorian Britain a male adult had an slightly higher life expectancy than a male adult in today's Britain. He excludes children but also women for good reason. https://www.gresham.ac.uk/lectures-and-events/return-of-the-microbes-how-infections-are-once-more-taking-over https://www.gresham.ac.uk/lectures-and-events/return-of-the-...
scarejunba 8y ago
TLDR: evidence suggests that humans are bathtub curved.
- taeric 8y ago
  Also that we have actually done a decent job removing many of the old early killers, no? Anti septics have made many old death notes non existent.
  - frockington 8y ago
    It always amazes me when to think that until Lister walking from a autopsy to a birth with no washing in between was never thought of twice. It's one of those things that seems so obvious today but wasn't in practice until recently. Much like sun exposure and smoking causing cancer
    - jaclaz 8y ago
      >until Lister Actually, the "pioneer", a bit earlier than Joseph Lister: https://en.wikipedia.org/wiki/Joseph_Lister https://en.wikipedia.org/wiki/Joseph_Lister was Ignaz Semmelweis: https://en.wikipedia.org/wiki/Ignaz_Semmelweis https://en.wikipedia.org/wiki/Ignaz_Semmelweis
      - frockington 8y ago
        Thanks for the link, it was a good read. Most surprising part was his friend "who had been accidentally poked with a student's scalpel" dying just from that. Absolutely crazy the amount of death just from improper sterilization
TangoTrotFox 8y ago
This is one thing that really changed my view on healthfulness. Here [1] is a list of Ancient Greeks. Looking at the age of death (for those that did not die in things such as war) does not really look all that different from modern society. But for all of the Greeks wonder and ingenuity, they remained mostly completely ignorant of medicine and illness. Miasma Theory [2] persisted as the dominant medical view throughout their civilization. Water 'purification' in most cases (on occasion it was boiled) did nothing to remove the tasteless toxins that can cause illness and water was mostly just judged by how clear it looked and how it tasted/smelled. Food safety again being something of a sniff/taste test. Vaccines of course would not be invented for thousands of years. Some of the quirks of their civilization included shared butt wiping sponges at public toilets - you'd clean off the sponge using either running water, or on occasion a bucket of vinegar. And so on. The point of this is that if we provided these Ancient Greeks with nothing but urgent life-saving emergency care from modern technology, it's highly likely that their life expectancy would dwarf ours of today. So what exactly was it in their culture that we've lost? They did so many things so differently that we can probably all kick in some confirmation bias to support our own personal hypotheses for some particular subset. But I prefer to just look at things holistically and consider that aiming to emulate their lifestyles is probably a better overall way to aim for a long and healthy life than is relying so heavily on medicine and technology. [1] - https://en.wikipedia.org/wiki/List_of_ancient_Greeks https://en.wikipedia.org/wiki/List_of_ancient_Greeks [2] - https://en.wikipedia.org/wiki/Miasma_theory https://en.wikipedia.org/wiki/Miasma_theory --------------- EDIT: Just, completely coincidentally, saw another related article here [3]. Anyhow, it provides an important datum: "More than 23 percent of Americans took three or more prescription drugs in the past 30 days, according to a 2017 CDC estimate. Furthermore, 39 percent over age 65 take five or more, a number that’s increased three-fold in the last several decades. There are about 1,000 known side effects and 5,000 drugs on the market, making for nearly 125 billion possible side effects between all possible pairs of drugs. Most of these have never been prescribed together, let alone systematically studied, according to the Stanford researchers." [3] - http://www.kurzweilai.net/how-to-predict-the-side-effects-of-millions-of-drug-combinations http://www.kurzweilai.net/how-to-predict-the-side-effects-of...
- batiudrami 8y ago
quotemstr 8y ago
Human lifespan has increased since ancient times, but not by that much. The idea that adults died at 30 is absurd, but persists everywhere anyway, mostly because it flatters us in the present. Look: a lot of sensational stuff about history is in fact bullshit. I recently read an article that demonstrated to my satisfaction that the whole "Easter Islander chopping down the last tree" idea is in fact fantasy and that rats, not people, ended up deforesting the place. Isn't it a shame that such a poetic example of the hubris of man ends up not actually being true? In reality, the past was pretty much like the present, and people today are pretty much like those of the past. Theories that rely on our ancestors being somehow obviously stupid or short-lived or morally deficient fall short of explaining the real world. If you actually read the first-hand accounts of people from ancient times, you'll find, well, people, with all the usual insecurities and foibles and temptations that exist today. (See the beautiful and sensitive correspondence between Eloisa and Abelard.) To risk making a broader point: I reject the whig-historical attitude in which the development of humanity is some kind of inexorable progression from an awful past to a benevolent present. In reality, the only progress is scientific --- physical laws, with numbers, that you write down and that work via math. Everything else is just a matter of fashion and taste, and there's no guarantee that our descendants will agree that what we consider "progress" is in fact good and right.
- aaron695 8y ago
  >Human lifespan has increased since ancient times, but not by that much. The idea that adults died at 30 is absurd, but persists everywhere anyway, mostly because it flatters us in the present. This is bollocks, and not what the article is talking about anyway. There's a good 20 year difference in life expectancy for a 20 year old between countries still. http://www.worldlifeexpectancy.com/your-life-expectancy-by-age http://www.worldlifeexpectancy.com/your-life-expectancy-by-a... And between these days and the olden days - https://www.ons.gov.uk/peoplepopulationandcommunity/birthsdeathsandmarriages/lifeexpectancies/articles/howhaslifeexpectancychangedovertime/2015-09-09 https://www.ons.gov.uk/peoplepopulationandcommunity/birthsde... The past was a awful awful place, everyone was in slave/war type conditions and simple scratches killed.
- barrkel 8y ago
  There's an unjustified leap from the concerns of individuals in their daily lives to the concerns of society as a whole in your post, and it casts a severe political shadow over your post. Individuals out of sight of the state or their overlords may have similar experiences in different ages, but there are also people who don't exist near the median who are persecuted to different degrees; not to mention that wealth distribution can also be radically different. These are also differences between modern societies, and may thus easily be inferred for past societies too. And your free choice of society today is not arbitrarily based in fashion or taste. Consider telling Oscar Wilde that there's been no progress since his day, and he was merely a victim of fashion!
Nursie 8y ago
I'm not seeing any actual figures here. My assumption has always been that infant mortality was a huge factor, but also that adult life expectancy was shorter. Perhaps not 40 years shorter, but shorter nonetheless because of disease and infection. I'm not actually seeing anything much to contradict this here.
- ItsMe000001 8y ago
  In this lecture "Return of the Microbes" the professor of medicine mentions in passing that in Victorian Britain a male adult had an slightly higher life expectancy than a male adult in today's Britain. He excludes children but also women for good reason (child birth used to be very risky). https://www.gresham.ac.uk/lectures-and-events/return-of-the-microbes-how-infections-are-once-more-taking-over https://www.gresham.ac.uk/lectures-and-events/return-of-the-...
  - Nursie 8y ago
    While that's interesting, I'm not sure it's really proven, he mentions it in passing and gives a figure for only a single town, I suspect cherry picked. And I've been to Blackpool, I'm hardly surprised the life expectancy there isn't up to much... I find the second graph here much more compelling, which shows across the country that there has been a steady improvement over time from 1841 to the present - https://www.ons.gov.uk/peoplepopulationandcommunity/birthsdeathsandmarriages/lifeexpectancies/articles/howhaslifeexpectancychangedovertime/2015-09-09 https://www.ons.gov.uk/peoplepopulationandcommunity/birthsde...
contingencies 8y ago
Alternate title: Ms. Cave on Cavemen
marcus_holmes 8y ago
Couple of things stood out: 1. Tooth wearing as a measure of age is complicated by bread. Saxon-era bread contains a lot of grit because it's ground between actual stones. Eating gritty bread wears down teeth. So a 30-year-old who ate bread their whole life would have teeth wear comparable to a much older person in a population that either didn't eat bread, or ate non-gritty bread (like we do today). We do know the Saxons were big bread-eaters. We don't know what population was used as the control for TFA. 2. The "grooming tool" thing is a little strange. The grooming tools appear as a set in the late Romano-British period, and vary between individuals, but are generally composed of tweezers, nail-cleaning blade, snips, a little spoon perfect for cleaning wax from ears, and similar stuff. They appear to have been worn dangling from the belt by a thong, carried around routinely like a Swiss army knife. It's reasonable to assume that at some point in your life, you got a set of them, either as a gift or because you could, and you carried on wearing them ever afterwards. So, yes, older people are more likely to have them ;) But not necessarily because old people were "higher status" or more into personal grooming.
southphillyman 8y ago
Interestingly, I grew up thinking the exact opposite. In the Torah Methuselah is mentioned as having lived 900+ years.
ojosilva 8y ago
> And some things about the past, such as men being valued for their power and women for their beauty, have changed little. I couldn't disagree more. Maybe in more primitive societies it hasn't - yet - but in Anglo-Saxon communities this is exactly what has and is changing. Today both women and men are praised for not only their power, but intelligence, integrity, communication and art among many other traits. As well as both men and women are praised today for their beauty, style and charm. I can't believe such interesting article could get it so wrong in its conclusion.

100 points by diodorus 8y ago

simonebrunozzi 8y ago

Most important difference: life expectancy at birth, vs life expectancy as an adult.

olliej 8y ago
Yup this is another article going “we aren’t living longer we’ve just stopped <5 years olds dying as often”
- 0xcde4c3db 8y ago
  Incidentally, life expectancy at 65 in multiple countries has been slowly creeping up over the past ~50 years, perhaps longer. Last I heard, nobody really had a good explanation as to why.
  - ENGNR 8y ago
    I like to think it's the slow death of the concept of retirement Work is purpose so long as it's engaging, and people with purpose do things to keep themselves going
    - laumars 8y ago
      I'm yet to meet anyone retired who says "I wish I was still working". Quite the opposite in fact.
      - deleted 8y ago
        [deleted]
      - alsetmusic 8y ago
        > I'm yet to meet anyone retired who says "I wish I was still working". Quite the opposite in fact. My brother and I both shared a fear that our father would waste away and die after retirement (he is extremely driven). It turned out that he “never has enough time” for all the projects he creates for himself post-retirement. He wrote a book, researches the family tree, travels, etc. It was surprising how much he wants, and finds ways to, remain active. I don’t think we were wrong to expect him to need an outlet. We simply did not anticipate that he would create his own.
    - olliej 8y ago
      Also politicians continue to push back the official retirement age, and so people literally cannot afford to retire. Note of course that this retirement age is not the official retirement age for senators and congressonal reps in America. The oldest retirement age for senators in the US is 62. Alternatively anything over 50 if you’ve served more than 20 years. Or any time at all once you’ve worked 25 years. Of course they’ve also ensured retirement for them is retirement with full pay. I’d love to get to retire with full pay after 25 years.
  - toomanybeersies 8y ago
    Improved medicine would probably be why. My grandfather lived for another 5 years than he probably would've without modern medicine. I don't know if they would've been able to operate on him in the 60's like they can in modern times.
    - kakwa_ 8y ago
      Medicine, not that much actually, I think most of the progress we have seen comes from food security and the sanitary movement. With those 2 items, you can basically get to a life expectancy of 70 years in most places, then you add modern medicine, and you go up another 10 years or so.
  - danieltillett 8y ago
    I think there are fewer people worn out by hard physical work. I look at how fast people who do hard physical work age compared to those of us who sit around in offices and it is scary.
  - 8bitsrule 8y ago
    I like to lay that largely on work environments. Physical labor and physical stress, long hours, wear and tear on body parts, more likelihood of disabling injuries & inflammation. Throw in better knowledge of good nutrition (less consumption of toxins) and the importance of exercise - inactivity is a slow killer. Finally, psychology ... more to live for, and the means to enjoy it.
  - notahacker 8y ago
    Doesn't seem surprising really. 65+ people are vulnerable to a lot of the same diseases which used to kill off infants, so increased access to sanitation, basic medical care and antibiotics is going to do a lot in developing countries, whilst survival rates for people with cancers and other degenerative conditions, victims of strokes and heart attacks etc have improved enormously for those with access to increasingly effective treatment.
- everdev 8y ago
  Another idea might be that modern medicine is in fact extending life, but other modern things like cars, cigarettes, junk food, etc. are simultaneously decreasing life span. So, I bet if you introduced modern medicine as the only change to an agrarian society you'd see an increase in life expectancy.
ItsMe000001 8y ago
And women. Giving birth used to be very risky business. In this lecture "Return of the Microbes" the professor of medicine mentions in passing that in Victorian Britain a male adult had an slightly higher life expectancy than a male adult in today's Britain. He excludes children but also women for good reason. https://www.gresham.ac.uk/lectures-and-events/return-of-the-microbes-how-infections-are-once-more-taking-over https://www.gresham.ac.uk/lectures-and-events/return-of-the-...

scarejunba 8y ago

TLDR: evidence suggests that humans are bathtub curved.

taeric 8y ago
Also that we have actually done a decent job removing many of the old early killers, no? Anti septics have made many old death notes non existent.
- frockington 8y ago
  It always amazes me when to think that until Lister walking from a autopsy to a birth with no washing in between was never thought of twice. It's one of those things that seems so obvious today but wasn't in practice until recently. Much like sun exposure and smoking causing cancer
  - jaclaz 8y ago
    >until Lister Actually, the "pioneer", a bit earlier than Joseph Lister: https://en.wikipedia.org/wiki/Joseph_Lister https://en.wikipedia.org/wiki/Joseph_Lister was Ignaz Semmelweis: https://en.wikipedia.org/wiki/Ignaz_Semmelweis https://en.wikipedia.org/wiki/Ignaz_Semmelweis
    - frockington 8y ago
      Thanks for the link, it was a good read. Most surprising part was his friend "who had been accidentally poked with a student's scalpel" dying just from that. Absolutely crazy the amount of death just from improper sterilization

TangoTrotFox 8y ago

This is one thing that really changed my view on healthfulness. Here [1] is a list of Ancient Greeks. Looking at the age of death (for those that did not die in things such as war) does not really look all that different from modern society. But for all of the Greeks wonder and ingenuity, they remained mostly completely ignorant of medicine and illness. Miasma Theory [2] persisted as the dominant medical view throughout their civilization. Water 'purification' in most cases (on occasion it was boiled) did nothing to remove the tasteless toxins that can cause illness and water was mostly just judged by how clear it looked and how it tasted/smelled. Food safety again being something of a sniff/taste test. Vaccines of course would not be invented for thousands of years. Some of the quirks of their civilization included shared butt wiping sponges at public toilets - you'd clean off the sponge using either running water, or on occasion a bucket of vinegar. And so on. The point of this is that if we provided these Ancient Greeks with nothing but urgent life-saving emergency care from modern technology, it's highly likely that their life expectancy would dwarf ours of today. So what exactly was it in their culture that we've lost? They did so many things so differently that we can probably all kick in some confirmation bias to support our own personal hypotheses for some particular subset. But I prefer to just look at things holistically and consider that aiming to emulate their lifestyles is probably a better overall way to aim for a long and healthy life than is relying so heavily on medicine and technology. [1] - https://en.wikipedia.org/wiki/List_of_ancient_Greeks https://en.wikipedia.org/wiki/List_of_ancient_Greeks [2] - https://en.wikipedia.org/wiki/Miasma_theory https://en.wikipedia.org/wiki/Miasma_theory --------------- EDIT: Just, completely coincidentally, saw another related article here [3]. Anyhow, it provides an important datum: "More than 23 percent of Americans took three or more prescription drugs in the past 30 days, according to a 2017 CDC estimate. Furthermore, 39 percent over age 65 take five or more, a number that’s increased three-fold in the last several decades. There are about 1,000 known side effects and 5,000 drugs on the market, making for nearly 125 billion possible side effects between all possible pairs of drugs. Most of these have never been prescribed together, let alone systematically studied, according to the Stanford researchers." [3] - http://www.kurzweilai.net/how-to-predict-the-side-effects-of-millions-of-drug-combinations http://www.kurzweilai.net/how-to-predict-the-side-effects-of...

batiudrami 8y ago

quotemstr 8y ago

Human lifespan has increased since ancient times, but not by that much. The idea that adults died at 30 is absurd, but persists everywhere anyway, mostly because it flatters us in the present. Look: a lot of sensational stuff about history is in fact bullshit. I recently read an article that demonstrated to my satisfaction that the whole "Easter Islander chopping down the last tree" idea is in fact fantasy and that rats, not people, ended up deforesting the place. Isn't it a shame that such a poetic example of the hubris of man ends up not actually being true? In reality, the past was pretty much like the present, and people today are pretty much like those of the past. Theories that rely on our ancestors being somehow obviously stupid or short-lived or morally deficient fall short of explaining the real world. If you actually read the first-hand accounts of people from ancient times, you'll find, well, people, with all the usual insecurities and foibles and temptations that exist today. (See the beautiful and sensitive correspondence between Eloisa and Abelard.) To risk making a broader point: I reject the whig-historical attitude in which the development of humanity is some kind of inexorable progression from an awful past to a benevolent present. In reality, the only progress is scientific --- physical laws, with numbers, that you write down and that work via math. Everything else is just a matter of fashion and taste, and there's no guarantee that our descendants will agree that what we consider "progress" is in fact good and right.

aaron695 8y ago
>Human lifespan has increased since ancient times, but not by that much. The idea that adults died at 30 is absurd, but persists everywhere anyway, mostly because it flatters us in the present. This is bollocks, and not what the article is talking about anyway. There's a good 20 year difference in life expectancy for a 20 year old between countries still. http://www.worldlifeexpectancy.com/your-life-expectancy-by-age http://www.worldlifeexpectancy.com/your-life-expectancy-by-a... And between these days and the olden days - https://www.ons.gov.uk/peoplepopulationandcommunity/birthsdeathsandmarriages/lifeexpectancies/articles/howhaslifeexpectancychangedovertime/2015-09-09 https://www.ons.gov.uk/peoplepopulationandcommunity/birthsde... The past was a awful awful place, everyone was in slave/war type conditions and simple scratches killed.
barrkel 8y ago
There's an unjustified leap from the concerns of individuals in their daily lives to the concerns of society as a whole in your post, and it casts a severe political shadow over your post. Individuals out of sight of the state or their overlords may have similar experiences in different ages, but there are also people who don't exist near the median who are persecuted to different degrees; not to mention that wealth distribution can also be radically different. These are also differences between modern societies, and may thus easily be inferred for past societies too. And your free choice of society today is not arbitrarily based in fashion or taste. Consider telling Oscar Wilde that there's been no progress since his day, and he was merely a victim of fashion!

Nursie 8y ago

I'm not seeing any actual figures here. My assumption has always been that infant mortality was a huge factor, but also that adult life expectancy was shorter. Perhaps not 40 years shorter, but shorter nonetheless because of disease and infection. I'm not actually seeing anything much to contradict this here.

ItsMe000001 8y ago
In this lecture "Return of the Microbes" the professor of medicine mentions in passing that in Victorian Britain a male adult had an slightly higher life expectancy than a male adult in today's Britain. He excludes children but also women for good reason (child birth used to be very risky). https://www.gresham.ac.uk/lectures-and-events/return-of-the-microbes-how-infections-are-once-more-taking-over https://www.gresham.ac.uk/lectures-and-events/return-of-the-...
- Nursie 8y ago
  While that's interesting, I'm not sure it's really proven, he mentions it in passing and gives a figure for only a single town, I suspect cherry picked. And I've been to Blackpool, I'm hardly surprised the life expectancy there isn't up to much... I find the second graph here much more compelling, which shows across the country that there has been a steady improvement over time from 1841 to the present - https://www.ons.gov.uk/peoplepopulationandcommunity/birthsdeathsandmarriages/lifeexpectancies/articles/howhaslifeexpectancychangedovertime/2015-09-09 https://www.ons.gov.uk/peoplepopulationandcommunity/birthsde...

contingencies 8y ago

Alternate title: Ms. Cave on Cavemen

marcus_holmes 8y ago

Couple of things stood out: 1. Tooth wearing as a measure of age is complicated by bread. Saxon-era bread contains a lot of grit because it's ground between actual stones. Eating gritty bread wears down teeth. So a 30-year-old who ate bread their whole life would have teeth wear comparable to a much older person in a population that either didn't eat bread, or ate non-gritty bread (like we do today). We do know the Saxons were big bread-eaters. We don't know what population was used as the control for TFA. 2. The "grooming tool" thing is a little strange. The grooming tools appear as a set in the late Romano-British period, and vary between individuals, but are generally composed of tweezers, nail-cleaning blade, snips, a little spoon perfect for cleaning wax from ears, and similar stuff. They appear to have been worn dangling from the belt by a thong, carried around routinely like a Swiss army knife. It's reasonable to assume that at some point in your life, you got a set of them, either as a gift or because you could, and you carried on wearing them ever afterwards. So, yes, older people are more likely to have them ;) But not necessarily because old people were "higher status" or more into personal grooming.

southphillyman 8y ago

Interestingly, I grew up thinking the exact opposite. In the Torah Methuselah is mentioned as having lived 900+ years.

ojosilva 8y ago

> And some things about the past, such as men being valued for their power and women for their beauty, have changed little. I couldn't disagree more. Maybe in more primitive societies it hasn't - yet - but in Anglo-Saxon communities this is exactly what has and is changing. Today both women and men are praised for not only their power, but intelligence, integrity, communication and art among many other traits. As well as both men and women are praised today for their beauty, style and charm. I can't believe such interesting article could get it so wrong in its conclusion.