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Ultimate limit of human endurance found - BBC News
The ultimate limit of human endurance has been worked out by scientists analysing a 3,000 mile run, the Tour de France and other elite events.

They showed the cap was 2.5 times the body's resting metabolic rate, or 4,000 calories a day for an average person. Anything higher than that was not sustainable in the long term.

The research, by Duke University, also showed pregnant women were endurance specialists, living at nearly the limit of what the human body can cope with. The study started with the Race Across the USA in which athletes ran 3,080 miles from California to Washington DC in 140 days.

The study found a pattern between the length of a sporting event and energy expenditure - the longer the event, the harder it is to burn through the calories. So people can go far beyond their base metabolic rate while doing a short bout of exercise, it becomes unsustainable in the long term.

The study also shows that while running a marathon may be beyond many, it is nowhere near the limit of human endurance.

Marathon (just the one) runners used 15.6 times their resting metabolic rate. Cyclists during the 23 days of the Tour de France used 4.9 times their resting metabolic rate. A 95-day Antarctic trekker used 3.5 times the resting metabolic rate. During pregnancy, women's energy use peaks at 2.2 times their resting metabolic rate.

"You can do really intense stuff for a couple of days, but if you want to last longer then you have to dial it back," Dr Herman Pontzer, from Duke University, told BBC News. "Every data point, for every event, is all mapped onto this beautifully crisp barrier of human endurance.

"Nobody we know of has ever pushed through it."

The researchers argue the 2.5 figure may be down to the human digestive system, rather than anything to do with the heart, lungs or muscles.

They found the body cannot digest, absorb and process enough calories and nutrients to sustain a higher level of energy use. The body can use up its own resources burning through fat or muscle mass - which can be recovered afterwards - in shorter events. But in extreme events - at the limits of human exhaustion - the body has to balance its energy use, the researchers argue.
endurance  energy  exercise  food  digestion  limits  BBC  Pontzer  2019 
10 days ago by zzkt
The secret life of DNS packets: investigating complex networks
ah, the joys of building production systems atop AWS and its poorly-documented limits:
One more surprising detail we discovered in the tcpdump data was that the VPC resolver was not sending back responses to many of the queries. During one of the 60-second collection periods the DNS server sent 257,430 packets to the VPC resolver. The VPC resolver replied back with only 61,385 packets, which averages to 1,023 packets per second. We realized we may be hitting the AWS limit for how much traffic can be sent to a VPC resolver, which is 1,024 packets per second per interface.
aws  limits  ops  stripe  vpc  dns  outages  postmortems  debugging 
24 days ago by jm
How Full is My Cluster? Capacity Management and Monitoring on OpenShift – Red Hat OpenShift Blog
Learn how capacity management and monitoring works on an OpenShift cluster, including quotas, requests, limits, and usage monitoring.
openshift  quotas  limits  monitoring 
4 weeks ago by essey
[Essay] | Faustian Economics, by Wendell Berry | Harper's Magazine
"The general reaction to the apparent end of the era of cheap fossil fuel, as to other readily foreseeable curtailments, has been to delay any sort of reckoning. The strategies of delay, so far, have been a sort of willed oblivion, or visions of large profits to the manufacturers of such “biofuels” as ethanol from corn or switchgrass, or the familiar unscientific faith that “science will find an answer.” The dominant response, in short, is a dogged belief that what we call the American Way of Life will prove somehow indestructible. We will keep on consuming, spending, wasting, and driving, as before, at any cost to anything and everybody but ourselves.

This belief was always indefensible — the real names of global warming are Waste and Greed — and by now it is manifestly foolish. But foolishness on this scale looks disturbingly like a sort of national insanity. We seem to have come to a collective delusion of grandeur, insisting that all of us are “free” to be as conspicuously greedy and wasteful as the most corrupt of kings and queens. (Perhaps by devoting more and more of our already abused cropland to fuel production we will at last cure ourselves of obesity and become fashionably skeletal, hungry but — thank God! — still driving.)"

"The normalization of the doctrine of limitlessness has produced a sort of moral minimalism: the desire to be efficient at any cost, to be unencumbered by complexity. The minimization of neighborliness, respect, reverence, responsibility, accountability, and self-subordination — this is the culture of which our present leaders and heroes are the spoiled children.

Our national faith so far has been: “There’s always more.” Our true religion is a sort of autistic industrialism. People of intelligence and ability seem now to be genuinely embarrassed by any solution to any problem that does not involve high technology, a great expenditure of energy, or a big machine. Thus an X marked on a paper ballot no longer fulfills our idea of voting. One problem with this state of affairs is that the work now most needing to be done — that of neighborliness and caretaking — cannot be done by remote control with the greatest power on the largest scale. A second problem is that the economic fantasy of limitlessness in a limited world calls fearfully into question the value of our monetary wealth, which does not reliably stand for the real wealth of land, resources, and workmanship but instead wastes and depletes it.

That human limitlessness is a fantasy means, obviously, that its life expectancy is limited. There is now a growing perception, and not just among a few experts, that we are entering a time of inescapable limits. We are not likely to be granted another world to plunder in compensation for our pillage of this one. Nor are we likely to believe much longer in our ability to outsmart, by means of science and technology, our economic stupidity. The hope that we can cure the ills of industrialism by the homeopathy of more technology seems at last to be losing status. We are, in short, coming under pressure to understand ourselves as limited creatures in a limited world.

This constraint, however, is not the condemnation it may seem. On the contrary, it returns us to our real condition and to our human heritage, from which our self-definition as limitless animals has for too long cut us off. Every cultural and religious tradition that I know about, while fully acknowledging our animal nature, defines us specifically as humans — that is, as animals (if the word still applies) capable of living not only within natural limits but also within cultural limits, self-imposed. As earthly creatures, we live, because we must, within natural limits, which we may describe by such names as “earth” or “ecosystem” or “watershed” or “place.” But as humans, we may elect to respond to this necessary placement by the self-restraints implied in neighborliness, stewardship, thrift, temperance, generosity, care, kindness, friendship, loyalty, and love.

In our limitless selfishness, we have tried to define “freedom,” for example, as an escape from all restraint. But, as my friend Bert Hornback has explained in his book The Wisdom in Words, “free” is etymologically related to “friend.” These words come from the same Indo-European root, which carries the sense of “dear” or “beloved.” We set our friends free by our love for them, with the implied restraints of faithfulness or loyalty. And this suggests that our “identity” is located not in the impulse of selfhood but in deliberately maintained connections."

"And so our cultural tradition is in large part the record of our continuing effort to understand ourselves as beings specifically human: to say that, as humans, we must do certain things and we must not do certain things. We must have limits or we will cease to exist as humans; perhaps we will cease to exist, period. At times, for example, some of us humans have thought that human beings, properly so called, did not make war against civilian populations, or hold prisoners without a fair trial, or use torture for any reason.

Some of us would-be humans have thought too that we should not be free at anybody else’s expense. And yet in the phrase “free market,” the word “free” has come to mean unlimited economic power for some, with the necessary consequence of economic powerlessness for others. Several years ago, after I had spoken at a meeting, two earnest and obviously troubled young veterinarians approached me with a question: How could they practice veterinary medicine without serious economic damage to the farmers who were their clients? Underlying their question was the fact that for a long time veterinary help for a sheep or a pig has been likely to cost more than the animal is worth. I had to answer that, in my opinion, so long as their practice relied heavily on selling patented drugs, they had no choice, since the market for medicinal drugs was entirely controlled by the drug companies, whereas most farmers had no control at all over the market for agricultural products. My questioners were asking in effect if a predatory economy can have a beneficent result. The answer too often is No. And that is because there is an absolute discontinuity between the economy of the seller of medicines and the economy of the buyer, as there is in the health industry as a whole. The drug industry is interested in the survival of patients, we have to suppose, because surviving patients will continue to consume drugs.

Now let us consider a contrary example. Recently, at another meeting, I talked for some time with an elderly, and some would say an old-fashioned, farmer from Nebraska. Unable to farm any longer himself, he had rented his land to a younger farmer on the basis of what he called “crop share” instead of a price paid or owed in advance. Thus, as the old farmer said of his renter, “If he has a good year, I have a good year. If he has a bad year, I have a bad one.” This is what I would call community economics. It is a sharing of fate. It assures an economic continuity and a common interest between the two partners to the trade. This is as far as possible from the economy in which the young veterinarians were caught, in which the powerful are limitlessly “free” to trade, to the disadvantage, and ultimately the ruin, of the powerless.

It is this economy of community destruction that, wittingly or unwittingly, most scientists and technicians have served for the past two hundred years. These scientists and technicians have justified themselves by the proposition that they are the vanguard of progress, enlarging human knowledge and power, and thus they have romanticized both themselves and the predatory enterprises that they have served."

"If the idea of appropriate limitation seems unacceptable to us, that may be because, like Marlowe’s Faustus and Milton’s Satan, we confuse limits with confinement. But that, as I think Marlowe and Milton and others were trying to tell us, is a great and potentially a fatal mistake. Satan’s fault, as Milton understood it and perhaps with some sympathy, was precisely that he could not tolerate his proper limitation; he could not subordinate himself to anything whatever. Faustus’s error was his unwillingness to remain “Faustus, and a man.” In our age of the world it is not rare to find writers, critics, and teachers of literature, as well as scientists and technicians, who regard Satan’s and Faustus’s defiance as salutary and heroic.

On the contrary, our human and earthly limits, properly understood, are not confinements but rather inducements to formal elaboration and elegance, to fullness of relationship and meaning. Perhaps our most serious cultural loss in recent centuries is the knowledge that some things, though limited, are inexhaustible. For example, an ecosystem, even that of a working forest or farm, so long as it remains ecologically intact, is inexhaustible. A small place, as I know from my own experience, can provide opportunities of work and learning, and a fund of beauty, solace, and pleasure — in addition to its difficulties — that cannot be exhausted in a lifetime or in generations.

To recover from our disease of limitlessness, we will have to give up the idea that we have a right to be godlike animals, that we are potentially omniscient and omnipotent, ready to discover “the secret of the universe.” We will have to start over, with a different and much older premise: the naturalness and, for creatures of limited intelligence, the necessity, of limits. We must learn again to ask how we can make the most of what we are, what we have, what we have been given. If we always have a theoretically better substitute available from somebody or someplace else, we will never make the most of anything. It is hard to make the most of one life. If we each had two lives, we would not make much of either. Or … [more]
wendellberry  2008  economics  science  technology  art  limits  limitlessness  arts  ecosystems  limitations  local  humanism  humanity  humility  community  communities  knowledge  power  expansion  growth  interdependence  greed  neighborliness  stewardship  thrift  temperance  christianity  generosity  care  kindness  friendship  loyalty  love  self-restraint  restraint  watershed  land  caring  caretaking  morality  accountability  responsibility  respect  reverence  corruption  capitalism  technosolutionism  fossilfuels  waste 
6 weeks ago by robertogreco
1960: The Year The Singularity Was Cancelled | Slate Star Codex
Heinz von Foerster: human population dynamics.

It seems possible that the Industrial Revolution was not a time of abnormally fast technological advance or economic growth. Rather, it was a time when economic growth outpaced population growth, causing a shift from a Malthusian regime where productivity growth always increased population at subsistence level, to a modern regime where productivity growth increases GDP per capita. The world remained on the same hyperbolic growth trajectory throughout, until the trajectory petered out around 1900 in Britain and around 1960 in the world as a whole.
history  growth  limits  population 
7 weeks ago by zryb
Treat your pods according to their needs - three QoS classes in Kubernetes
One of the features that comes with Kubernetes is its ability to scale horizontally services running on it and use available resources more efficiently. I’ve been hearing that containers are just lightweight virtualization (which is not true) so you can put more apps on the same resources.
kubernetes  limits  qos  quotas  resource 
march 2019 by yufufi

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