Hypothese Complexite
Sommaire
La biosphère est un environnement en limite de déséquilibre permanent
La biosphère est un environnement en déséquilibre permanent qu’il faut constamment ré-équilibrer : les systèmes complexes du vivant s’organisent toujours au maximum de la complexité possible, à la frontière de l’instabilité.
 Les points blancs représentent les écosystèmes qui s’organisent à la limite du domaine de stabilité et non pas de façon plus robuste en dedans Ref. Hors Série "Pour la Science" sur la complexité) |
Les systèmes complexes, de manière générale, semblent s'organiser en limite de déséquilibre et présentent une certaine fragilité.
Un système complexe est « fragile » et divergera de sa position d’équilibre tôt ou tard ?
Cette question peut aussi se négocier sous un autre aspect : celle qui consiste à considérer un système complexe comme une machine de turing. La complexité augmentant il est suggéré la croissance corrélée de « points aveugles » c'est-à-dire des classes de problèmes qui ne sont plus calculables. De fait en tant que système complexe, l’atmosphère « bogue » inévitablement tôt ou tard il part en déroute..
H1.1: un système dynamique complexe si on le laisse évoluer seul SE PLANTERA tot ou tard ?
- démontrer que des systèmes suffisamment riches et complexes se plantent toujours.
H1.2: Une intervention exogène est-elle nécessaire pour prévernir de ses plantages réaliser des corrections, pour sortir d'une boucle (attracteur?) ou de ce que les logiciens appellent les points aveugles de la machine de Turing ?
- démontrer que toute machine de Turing a des points aveugles qui la font diverger dans ses calculs.
« point aveugle »
Les « points aveugles » sont des défauts dans la structure logique qui est à la base de ce calcul.
Cette idée rejoint des paradigmes tels que ceux de la thèse de « church-turing » : tout n’est pas calculable, et il y a donc nécessité de choisir des « meta-niveaux » pour résoudre certains problèmes.
Par ailleurs, le problème de l'arrêt est indécidable : ce théorème a une conséquence importante : il n'existe pas de procédé systématique qui, pour un algorithme arbitraire, permet de savoir s'il s'achève pour des données fixées.
Je pense que l’idée est de penser qu’une MTU qui s’applique à un nombre varié et indéfini de problèmes fini effectivement tôt ou tard par tomber sur un problème qui le fait boucler, (ce ne sera peut-être pas le premier pb résolu, ni le deuxième, mais le nième). A ce moment là, notre MTU sera à réinitialiser (coincée dans un état)
Sauf, sauf, exécution d’un ordre « hors-contexte » (au niveau « meta ». Paradoxe de russel, etc.) Exécuter un RESET par exemple. C’est cet ordre qui permet « le contrôle » in fine du système en déroute…
Il doit être possible de calculer en fonction de la complexité du programme, statistiquement, le nombre de boucles possibles. En fait, chaque règle de transition (laissant le pointeur passer de q à q’) est potentiellement source de création d’une boucle.
Les OVNI un système de contrôle ?
Paramètres environnementaux sous contrôle ?
Si nous pouvons vérifier l'existence d'une corrélation entre les phénomènes observés et notre environnement, une autre question émerge:
cette corrélation s'accompagne t-elle de "corrections" de la part du système qui observe ?
H1: Ces corrélations sont-elles l'expression d'un système de contrôle ?
J.Vallée : «Une nouvelle analyse sur ordinateur des tendances historiques, que j'effectuai vers le milieu des années 70, fournit un graphique remarquable montrant des « vagues » d'activité qui n'avaient rien de périodique. Fred Beckman et le professeur Price-Williams (de l'Université de Californie à Los Angeles) découvrirent une ressemblance entre cette évolution et les « schémas de renforcement » qui sont typiques d'un processus d'entraînement ou d'apprentissage : le phénomène se comportait comme un système de contrôle plutôt que comme une expédition de voyageurs extraterrestres."
[...] Si le phénomène OVNI représente un système de contrôle, pouvons-nous le tester pour déterminer s'il est naturel ou artificiel, ouvert ou fermé ? C'est une des questions les plus intéressantes que l'on puisse poser à propos du phénomène et elle n'a pas encore reçu de réponse.»
Difficile de répondre à la question sans une connaissance fine des mécanismes qui sous-tendent l'équilibre de la biosphère, et de quelle façon nous pourrions noter un désaccord entre ce qui "devrait être" observé (en termes de dynamique) et ce qui "est" observé.
Nous pouvons toutefois faire quelques constatations qui suggérent pourquoi un tel contrôle serait "utile" voire "nécessaire".
Contrôle, anomalies et attracteur
Peut-on relever des anomalies dans l'évolution des paramètres environnementaux à différentes échelles du temps (contrôle et/ou stabilisation) ? Encore une fois, il semble difficile de se prononcer en l'état actuel des connaissances. Tout cela ne saurait être que de la spéculation.
Il est toutefois déjà possible de dresser une liste, des événements climatiques majeurs relevés et leur évolution au cours du temps. Ces événements s'expliquent-ils parfaitement ? Présentent-ils des anomalies ?
Modèlisation systèmique
Si les phénomènes observés correspondent à un phénomène de contrôle sur la biosphère (qui est, déjà en soit, un phénomène complexe non finement modélisable) alors les phénomènes observés présenteront des caractéristiques similaires à certains réseaux neuronaux "qui apprennent":
- Ils comporteront des schémas de renforcement permettent de prendre en compte de manière optimale les changements de comportement à l'intérieur du système, par octroi de récompense ou de pénalité selon les résultats obtenus. Dans le domaine des RN, les schémas de renforcement sont appelés « boucles de rétroaction ». Ces boucles de rétroaction permettent de contrôler les changements. Soit :
- en parvenant à contrôler l’environnement en dépit des perturbations ( « asservissement »)
- en réalisant un système de poursuite, afin de lier l’environnement à une trajectoire prédéfinie.)
Evolution de paramètres environnementaux
Mise en perspective dans le temps des principaux phénomènes sur lesquels nous disposons de connaissances.
Atmosphère
Courbe d'évolution des températures
(comparer avec la même courbe, sur une échelle non logarithmique)Il s’agit d’une courbe de température déduite de la composition isotopique de la neige issue d’un carottage au groenland. Le rapport oxygène 18/oxygène 16 contenu dans la neige donne une information sur les variations de température passées. En haut, la courbe représente la température des 10 000 ans passés (l'Holocène), en bas les 120 000 ans passés. Si l’on essaye de projeter de façon homogène les variations : nous nous apercevons que nous vivons une période de stabilité sans équivalent dans le passé (à comparer avec des variations de 10° en 10 ans possibles) ;
“The ice story may also hold the secrets about how civilisation began and how it may end. Kolbert quotes insights from her discussion with J.P Steffensen, the leader of the North Greenland Ice Project: "Now you are able to put human evolution into a climatic framework. You can ask 'Why did human beings not make civilisation 50,000 years ago?' You know that they had just as big brains as we have today. When you put this into a climatic framework you can say, 'well it was the ice age'. And also this ice age was so climatically unstable that each time they had the beginnings of a culture you had to move. "Then comes the present interglacial --10,000 years of very stable climate. The perfect conditions for Agriculture. If you look at it, its amazing. Civilisations in Persia, in China, and in India start at the same time, maybe 6000 years ago. They all developed writing and they all developed religion and they all built cities, all at the same time, because the climate was stable. I think that if the climate would have been stable 50,0000 years ago it would have started then. But they had no chance." Said JP Steffensen. »
Ce qu'explique JP Steffensen c'est que les civilisations prennent leur essor vers -10000 ans (-12000 plutôt je dirais) précisément à l'époque à laquelle les températures se stabilisent: cela correspond à la naissance de l'agriculture et du commerce notamment…
Alors que cela faisait des dizaines de milliers d'années que l'homme était "prêt" (semble t-il) sur le plan évolutif.
Qui/Quoi contrôle ?
H2: Tout système "suffisamment riche et complexe" est-il susceptible de montrer des signes d'intelligence voire de conscience?
Dit autrement: tout système suffisamment riche et complexe est au moins une machine de Turing universelle. 3 exemples de systèmes naturels :
- Le système solaire avec ses principaux corps,
- L'atmosphère terrestre,
- La surface du soleil.
Annexe
Jacques Vallee Discusses UFO Control System
Jerome Clark, FATE Magazine, 1978
Summary: Noted scientist-UFO researcher proposes a startling theory about what UFOs may be, how they behave and what we can do about them. Interview by Jerome Clark.
Dr. Jacques Vallee, a French-American computer specialist with a background in astrophysics, once served as consultant to NASA's Mars Map project. Jacques Vallee is one of ufology's major figures - and also its most original thinker.
Vallee, who holds a master's degree in astrophysics and a Ph.D. in computer science from Northwestern University, was an early scientific proponent of the theory that UFOs are extraterrestrial spaceships. His first book, Anatomy of a Phenomenon (Henry Regnery, 1965), argued eloquently that "through UFO activity … the contours of an amazingly complex intelligent life beyond the earth can already be discerned." In Challenge to Science - The UFO Enigma (Regnery, 1966) he and Janine Vallee (who is a psychologist by training, with a master's degree from the University of Paris) urged the scientific community to consider the UFO evidence in this light.
But by 1969, when he published Passport to Magonia (Regnery), Vallee's assessment of the UFO phenomenon had undergone a significant shift. Much to the consternation of the "scientific ufologists" who had seen him as one of their champions, Vallee now seemed to be backing away from the extraterrestrial hypotheses and advancing the radical view that UFOs are paranormal in nature and a modern space age manifestation of a phenomenon which assumes different guises in different historical contexts.
" When the underlying archetypes are extracted," he wrote, "the saucer myth is seen to coincide to a remarkable degree with the fairy-faith of Celtic countries … religious miracles… and the widespread belief among all peoples concerning entities whose physical and psychological descriptions place them in the same category as the present-day ufonauts."
In The Invisible College (E.P. Dutton, 1975) Vallee posits the idea of a "control system." UFOs and related phenomena are "the means through which man's concepts are being rearranged." Their ultimate source may be unknowable, at least at this stage of human development; what we do know, according to Vallee, is that they are presenting us with continually recurring "absurd" messages and appearances which defy rational analysis but which nonetheless address human beings on the level of myth and imagination.
"When I speak of a control system for planet earth," he says, " I do not want my words to be misunderstood: I do not mean that some higher order of beings has locked us inside the constraints of a space-bound jail, closely monitored by psychic entities we might call angels or demons. I do not propose to redefine God. What I do mean is that mythology rules at a level of our social reality over which normal political and intellectual action has no power…."
Vallee is also coauthor, with J. Allen Hynek, of The Edge of Reality (Regnery, 1975). A resident of the San Francisco area, he is completing a book which further develops his theories concerning UFO phenomena.
We have talked together at some length about his beliefs. The following interview is a report of these conversations:
Clark: Since the great autumn 1973 sighting wave public attitudes about the UFO phenomenon seem to have changed dramatically, to the extent that society may be entering a pivotal period in its perception of the problem. What do you think will happen now?
Vallee: First, I expect increased government and scientific attention to it. More researchers will be pursuing the physical evidence aspects, conducting much more sophisticated investigations of traces left at landing sites and so on. The people moving into the field now are good physicists and good engineers who know what they are doing and who are convinced it is time for them to get involved.
At the same time I expect that public opinion will change also. Initially it probably will move strongly toward the extraterrestrial explanation. Most people see only two ways to look at the problem - either it's all nonsense or we're being visited from outer space. The current spate of movies, books and magazine articles is going to push people toward the extraterrestrial hypothesis. After that I expect a backlash effect may push them in the other direction. I don't know where that's going to leave scientists who want to do research.
Clark: You say that scientists are entering ufology in search of physical evidence. But is there physical evidence? And if there is, are they going to find it? What happens if they don't?
Vallee: If I were speaking for them I would say, "Jerry, it's premature to ask those questions." One doesn't know the answers until one really looks - and so far nobody has looked very seriously. So far the people who have looked have been military types searching for enemy craft or direct threats to national security. Or they've been superficial investigators, dedicated civilians with good training but limited time and limited resources.
But you're asking me what I think. I think there are physical data. They are very, very interesting. They may contain a message. My inclination is to look at the message both in a physical sense and in a symbolic sense, but that's because I'm an information scientist and not a physical scientist. I look for the meaning behind the object.
Let me give you an example of what I mean. Recently Paul Cerny investigated a case in northern California in which two older persons saw a UFO take off. Afterwards they saw a sort of ring on the ground. Within the ring they found some molten metal and a pile of sand.
Obviously here is physical evidence. Two tangible things - the molten metal, which turned out to be brass, and the sand. I took some of the latter to a geologist friend who knows about sand. He said it was highly unusual because it did not contain quartz and it was not stream sand or beach sand or residue from mining or anything else. It seemed to be artificial sand created from grinding together stones of different origin.
Well, to a physicist that may not mean too much. It's an indication of something that turns out to be absurd. We can put it alongside other cases of physical traces and then we may start looking for patterns which might lead us to a better understanding of the modus operandi of whoever's doing all this.
In that sense, yes, there is physical evidence. But if you mean physical evidence in the sense that we're going to discover somebody's propulsion system from it, I would have to say I don't expect that to happen.
Clark: Can we infer from the existence of physical evidence, then, that there is a physical cause?
Vallee: If the UFO phenomenon had no physical cause at all, there would be no way for us to perceive it because human beings are physical entities. So it has to make an impression on our senses somehow. For that to take place, it has to be physical at some time.
Clark: So in other words there is such a thing as a solid, three-dimensional flying saucer.
Vallee: No, I didn't say that. That may or may not be true. I don't think there is such a thing as the flying saucer phenomenon. I think it has three components and we have to deal with them in different ways.
First, there is a physical object. That may be a flying saucer or it may be a projection or it may be something entirely different. All we know about it is that it represents a tremendous quantity of electromagnetic energy in a small volume. I say that based upon the evidence gathered from traces, from electromagnetic and radar detection and from perturbations of the electromagnetic fields such as Dr. Claude Poher, the French space scientist, has recorded.
Second, there's the phenomenon the witnesses perceive. What they tell us is that they've seen a flying saucer. Now they may have seen that or they may have seen an image of a flying saucer or they may have hallucinated it under the influence of microwave radiation, or any of a number of things may have happened. The fact is that the witnesses were exposed to an event and as a result they experienced a highly complex alteration of perception which caused them to describe the object or objects that figure in their testimony.
Beyond there - the physical phenomenon and the perception phenomenon - we have the third component, the social phenomenon. That's what happens when the reports are submitted to society and enter the cultural arena. That's the part which I find most interesting.
Clark: Before we go into that, let's clarify your views on the nature of the physical aspect. When I asked you if there was such a thing as a solid, three-dimensional flying saucer, I was thinking in these terms: Let's suppose that somebody says he has seen a UFO, the bottom part of which was flat and circular. He says he saw the object come down, settle on the soil and then fly off again, leaving a flat circular impression. Doesn't that clearly suggest the presence - at least for the duration of the sighting - of a solid object whose physical structure was more or less as the witness perceived it?
Vallee: Not necessarily. We have evidence that the phenomenon has the ability to create a distortion of the sense of reality or to substitute artificial sensations for the real ones. Look at some of the more bizarre close encounter cases - for example the incident from South America in which one man believed he had been abducted by a UFO while his companion thought he had boarded a bus which had suddenly appeared on the road behind then.
It is conceivable that there is one phenomenon which is visual and another which creates the physical traces. What I'm saying is that a strange kind of deception may be involved.
Clark: In other words the physical traces are placed there as ostensible confirmation of what the senses perceived?
Vallee: Yes. It's comparable perhaps to the strategic deception operations of the British during World War II to fool the Germans. They created artificial tank tracks in the desert and in other ways simulated the passage of large armored divisions. They even caused dust storms to perpetuate the illusion, which the Germans found very convincing indeed.
In the UFO context that might explain cases such as the one in California I mentioned earlier, in which the "physical evidence" left in the wake of the UFO appearance really seemed to have no clear, unambiguous connection with the perceived "object."
Clark: What do you think happens during the "UFO experience?"
Vallee: We don't know. There is no question that something happens. It seems as if an external force takes control of people. In the close encounters people may lose their ability to move or to speak; in the abduction cases, which are the most extreme example, they gradually enter into a series of experiences during which they lose control of all their senses. Do they experience what they think they experience? Suppose you, an outside observer, had been there. What would you have seen?
Clark: I can think of several cases which might suggest I would have seen the same thing they saw. To cite an example, one of the famous Venezuelan humanoid encounters of late 1954 was independently observed by a doctor some distance from the scene.
Vallee: Yes, I'm familiar with that incident and similar ones. But that doesn't alter my point. The doctor may have experienced the object as "real" but we don't know what the nature of that reality is.
We know there are objects that contain a lot of energy in a small space. What do we know about what happens to the human brain when it's exposed to a great deal of energy? We know very little about that. We don't know much about the effects of electromagnetic or microwave radiation on the brain, nor about the effects of pulsating colored lights on the brain. The research into that is just beginning.
What we do know is that you can make people hallucinate using either lights or microwave or electromagnetic energy. You can also make them pass out; you can cause them to behave strangely, put them into shock, make them hear voices or even kill them.
Clark: Is there any way to penetrate to the reality of the experience, for example through hypnotic regression?
Vallee: I'm not sure that what we learn under hypnotic regression is useful. Hypnosis is really a delicate technique and some of the people in our field who are using it are doing more harm than good. If the hypnotist doesn't have medical training - and most of these people have no medical training - the results may be disastrous for the witness. But if the hypnotist does have medical training and doesn't have any knowledge of the subject, he may ask the wrong questions. I think that may have happened in the famous case of Betty and Barney Hill. The hypnotist was extremely skilled but was not especially interested in UFOs and didn't know the background of the problem.
Clark: What can we do, then?
Vallee: I'm not saying that hypnosis has no role to play in UFO investigation, nor that it can't be helpful under certain circumstances when percipients are blocking from their memories something they have seen or experienced.
The thing I really want to emphasize is that the investigator's first responsibility is to the witness and not to the UFO phenomenon. The average witness is in shock because he's had a very traumatic experience; what he's seen is going to change his life. Your intervention, the very fact that you're talking with him about it, is also going to have an effect on him. Now he may say to you, "I need help to understand what I saw," but in fact he needs more immediate help as a human being who is deeply troubled by a very disturbing experience.
Unfortunately this element has been neglected. The more UFO investigators try to appear "professional," the more they ignore that human aspect - and by extension their own ethical obligations. I want to convince my friends in UFO research that whenever we have a choice between obtaining interesting UFO data and taking chances with the life of a human being, we should forget the UFO data.
Another thing to keep in mind is that there are alternatives to the use of hypnosis. These involve putting the percipient into a state of relaxed revery or free association. There are several techniques that are equally as effective as hypnosis in bringing out the hidden details but are must less harmful. Investigators really haven't made use of these yet.
Clark: What do you think of the abduction cases?
Vallee: Again, I'm interested mainly in their symbolic contents.
Let me explain what I mean. We live in a society that is oriented toward technology, so when we see something unusual in the sky we think of it in physical terms. How is it manufactured? What makes it tick? What is its propulsion system? We tend to assume that the physical phenomenon is its most important aspect and that everything else is just a side effect and much less important.
But perhaps we're facing something which is basically a social technology. Perhaps the most important effects from the UFO technology are the social ones and not the physical ones. In other words the physical reality may serve only as a kind of triggering device to provide images for the witness to report. These perceptions are manipulated to create certain kinds of social effects.
If that's true, then the abduction cases are quite revealing. I am not concerned with how many switches there were on the control panel or whether the percipient felt hot or cold when he was inside the flying saucer. Those questions may be totally irrelevant because maybe that person never actually went inside the object.
But the report is extremely important for its symbolic content. It can help us understand what kinds of images are coming through. One might illustrate the difference in this way:
An engineer observing a computer would want to look at the back and open up the boxes. He would want to take a probe and examine the different parts of the computer. But there is another way of looking at it; the way of the programmer, who wants to sit in front of the computer and analyze what it does, not how it does it. That's my approach. I want to ask it questions and see what answers I get. I want to interact with it as an information entity.
In the case of the abductions I think we're dealing with the information aspect. I came to that conclusion because abduction cases, in close encounter cases in general, what the witness is saying is absurd.
Clark: What do you mean?
Vallee: I don't mean simply to imply that the account is silly. I mean it has absurdity as a semantic construction. If you're trying to express something which is beyond the comprehension of a subject, you have to do it through statements that appear contradictory or seem absurd. For example, in Zen Buddhism the seeker must deal with such concepts as "the sound of one hand clapping" - an apparently preposterous notion which is designed to break down ordinary ways of thinking. The occurrences of similar "absurd" messages in UFO cases brought me to the idea that maybe we're dealing with a sort of control system that is subtly manipulating human consciousness.
Clark: But how do you prove that one is operating in a UFO context?
Vallee: I've always been unhappy with the argument between those who believe UFOs are nonsense and those who believe they are extraterrestrial visitors. I don't think I belong in either camp. I've tried to place myself between those two extremes because there's no proof that either proposition is correct. I've come up with the control system concept because it is an idea which can be tested. In that sense it's much closer to a scientific hypotheses than the others. It may turn out that there is a control system which is operated by extraterrestrials. But that's only one possibility.
There are different kinds of control systems - open ones and closed ones - and there are tests you can apply to them to find out what kind of control system you're inside. That leads to a number of experiments you can do with the UFO phenomenon, whereas the other interpretations don't lead you to anything. If you're convinced that UFOs are extraterrestrial, then about the only thing you can do is to climb to a hilltop with a flashlight and send a message in Morse code. People have tried that, I know, but it doesn't seem to work very will!
The control system concept can be tested by a small group of people - you don't need a large organization or a lot of equipment - and you can start thinking about active intervention in the phenomenon.
Clark: How could I prove to my satisfaction that there is a control system in operations?
Vallee: If you think you're inside a control system, the first thing you have to look for is what is being controlled and try to change it to see what happens. My friend Bill Powers proposes the following analogy:
Suppose you're walking through the desert and you see a stone that looks as though it was painted white. A thousand yards later you see another stone of similar appearance. You stop and consider the matter. Either you can forget it or - if you're like me - you can pick up the stone and move it a few feet. If suddenly a bearded character steps out from behind a rock and demands to know why you moved his marker, then you know you've found a control system.
My point is that you can't be sure until you do something. Then you realize that what you were seeing, the thing that looked absurd and incongruous, was really a marker for a boundary that was invisible to everybody else until you discovered it because you looked for a pattern. I think that's exactly what we have to do with UFOs. We have to do something that will cause them to react. And I don't mean building landing strips in the desert and waiting out there to welcome the space brothers.
Clark: But what do you mean?
Vallee: I hesitate to be too specific. I'm speaking, as I'm sure you understand, of the attempted manipulation of UFO manifestations. It's a pretty tall order. We're assuming that there is a feedback mechanism involved in the operations of the control system; if you change the information that's carried back to that system, you might be able to infiltrate it through its own feedback.
Clark: How does one go about investigating UFOs, taking into consideration the possible existence of a control system?
Vallee: You should work outside any organized UFO group. Also you must be very careful about the types of instruments you use for your analysis. For example, I have become increasingly skeptical of the use of computers in UFO research. We're losing a great many data because of a certain situation that is developing: The field researcher will spend a lot of time and money investigating a case. Typically he will write it up in an excellent 10-to-20-page report; then he'll send it to his superiors in the organization, assuming that they are going to put it on the computer and that in this way it's going to add to some great body of knowledge.
But it doesn't. Investigators should understand that their reports go absolutely nowhere. They end up in a drawer somewhere, they are never published, and they're quickly forgotten. All that's left in the computer is a bunch of codes and letters and numbers on magnetic tape somewhere and that's the end of that.
For another thing you don't want to go around chasing every UFO that's reported. If a sighting gets a lot of publicity, you should stay the hell away from it. Instead you should go after cases that you select yourself, ones that have received very little publicity and you've heard about through personal channels. There are plenty of those and they are surprisingly rich in content. You should take your time investigating them. Get involved with the people as human beings. And then you have to become part of the scene, getting as close as you can to what's happening especially if it continues to happen.
Clark: Are you suggesting that the investigator should attempt to experience the phenomenon himself?
Vallee: Yes, I think that's sound scientific practice.
Clark: But isn't that rather dangerous - in the sense that there's a real risk the investigator, even if he is emotionally stable and intellectually sophisticated, might be overwhelmed by the experiences involved?
Vallee: Yes, there are dangers. Witness what happened to Morris Jessup or to Jim McDonald. But I think that now we're more aware of what the dangers are. Once you realize the phenomenon may be deliberately misleading, then you can use certain safeguards. I'm not saying that safeguards are always going to work. There is an element of danger you really can't avoid. There's no way to do that kind of study just by reading books.
It's a little bit like the study of volcanoes. You can learn a lot about them by watching them from a distance but you certainly learn a lot more when you can be right there - even if it's somewhat risky.
