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Everything regarding Science, Technology, Robotics and why not Mathematics while we are at it...
  1. What's new in this club
  2. Well worth reading LNN's link: -
      Hello guest!
    No physicist has yet found any flaw.
  3. I think zero and lemniscate are my two favorite numbers now. 😉
  4. Maybe seeing this for a 2nd time may make me remember this term? I was updating a thread on infinity and noticed this earlier post tagged appropriately. This is the power of note taking / documentation.
  5. Zero is the opening act of Creation (the Big Bang?) One is where I started at conception. (thanks Mom & Dad) Infinity is where I'm going. (...thanks to all of you I meet on this journey)
  6. The twin polarities of zero and infinity are akin to yin and yang — as Charles Seife, author of Zero: Biography of a Dangerous Idea, describes them:
  7. the 𝝅 symbol was introduced by William Jones in 1706.
  8. Learnt three approximations of π in school: 22/7 355/113 333/106
  9. 3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230664709384460955058223172535940812848111745028410270193852110555964462294895493038196442881097566593344612847564823378678316527120190914564856692346034861045432664 Your welcome!
  10. Cherenkov light appears when a charged particle travels through matter faster than light can. This effect is the optical equivalent of a sonic boom, which occurs, for example, when a jet travels faster than the speed of sound. But how can a particle go faster than light without violating the laws of physics? The speed of light in a vacuum is the ultimate speed limit: 300,000,000 meters per second. It's thought that nothing can travel faster. However, light slows down when it goes through water, glass and other transparent materials—in some cases by more than 25 percent. Hence a particle can slip through material faster than light does, while at the same time staying below the speed of light in a vacuum. When this happens, a particle emits bluish Cherenkov light, which spreads out behind it in a hollow cone that is shaped like the cone of a sonic boom. This light gives the water surrounding a nuclear reactor core its distinctive blue glow.
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    So ... is the particle giving off light? or just nearby photons reacting to the super fast particle?
  11. Hey @xero would you also like to join the JW Only club?
  12. "An energy-harvesting circuit based on graphene could be incorporated into a chip to provide clean, limitless, low-voltage power for small devices or sensors," said Paul Thibado, professor of physics and lead researcher in the discovery. The findings, published in the journal Physical Review E, are proof of a theory the physicists developed at the U of A three years ago that freestanding graphene—a single layer of carbon atoms—ripples and buckles in a way that holds promise for energy harvesting. The idea of harvesting energy from graphene is controversial because it refutes physicist Richard Feynman's well-known assertion that the thermal motion of atoms, known as Brownian motion, cannot do work. Thibado's team found that at room temperature the thermal motion of graphene does in fact induce an alternating current (AC) in a circuit, an achievement thought to be impossible. In the 1950s, physicist LĂ©on Brillouin published a landmark paper refuting the idea that adding a single diode, a one-way electrical gate, to a circuit is the solution to harvesting energy from Brownian motion. Knowing this, Thibado's group built their circuit with two diodes for converting AC into a direct current (DC). With the diodes in opposition allowing the current to flow both ways, they provide separate paths through the circuit, producing a pulsing DC current that performs work on a load resistor.
      Hello guest!
  13. The guy who wrote The Graduate—the book, not the movie—gave away all the money he made from writing it. He bought a house with his one-time movie rights. He gave it away within weeks—he would give three away during his lifetime—a lifetime that ended July 2020, He was 81. The movie ‘The Graduate’ was a sensation—the highest grossing film of 1967, with seven academy award nominations. It is fussed over to this day for capturing the “alienation of modern youth”—though they are not so modern anymore, have long since put their alienation behind them, and many have done quite well for themselves, thank you very much. Many ultimately chose the life of plastic that the Graduate protagonist rejected. But not author Charles Webb and his wife. Several times they came into money, and each time they would give it away. The Graduate movie is ranked the 17th greatest American film of all time by the American Film Institute; the “coming of age story is indeed one for the ages,” gushes Rotten Tomatoes. Webb didn’t make a dime off it and didn’t want to. He wouldn’t even do book signings—they were “a sin against decency.” What kind of a guy does this? Many times he received windfalls. Each time he gave it away. “Mercifully I wasn’t written into [the Graduate movie] deal,” he told the AP. “Nobody understands why I felt so relieved, but I count my longevity to not being swept into that. My wife and I have done a lot of things we wouldn’t have done if we were rich people. ... I would have been counting my money instead of educating my children.” He’s not kidding about educating his children. He and his wife Fred—she took that name so as to identify with a group of men named Fred afflicted with low self-esteem (you’re guess is as good as mine)—pulled their two children from school. They homeschooled. This resonates with me because I did the same, only mine were not pulled out—they never saw the inside of a school other than an experimental 6th grade, after which both chose to homeschool again. Homeschooling wasn’t legal when Webbs did it. It was when we did, even if a little dicey—there were always unpredictable hoops to jump through. Once, the school district turned down my curriculum plan on the basis of, of all things, a weak music curriculum. The kids were enrolled in Suzuki violin, for crying out loud! I went to the library, copied and submitted some gobbledygook from a music textbook, and they were as happy as pigs in mud. A set of older friends in another jurisdiction were constantly harassed over their homeschooling—much more so than us. Yet my pal later reflected on his younger kids that were homeschooled vs his older ones that were not, and observed that the those of the first batch were far better at interacting with all factions of the community. Pretty much the same experience here—not that we had the contrast but we did have the experience of kids who readily mixed with all ages—whereas when I was in grade school, those kids in even one grade up might have been on another planet, to say nothing of adults. “I had no idea that there were so many stupid people,” said my son in complete innocence after he enrolled in the community college at age 16 and began his second experience in the classroom. The Webbs moved around a lot, sometimes camping, sometimes living out of a Volkswagen bus. Oldest son John called that part of his education “unschooling.” I know what unschooling is, too. We did it at times. It is simply a less rigid homeschooling, with more forbearance for letting youngsters pursue their own interests. I’d love to speak with these two kids—now adults. How did they turn out? “Not a lot of people picked up on it, but the title of ‘The Graduate’ was supposed to convey it was about education,” Webb told some reporter in 2006. He wasn’t keen on the mainstream model. Meanwhile, he and/or his artist wife did stints at KMart, picked fruit, cleaned houses. “When you run out of money, it’s a purifying experience,” he said. Besides the VW bus, they lived in motels, trailer parks, even a nudist colony—they managed that place during their tenure. They named their dog ‘Mrs. Robinson.’ Now, these two were not Jehovah’s Witnesses. I don’t want to imply that they were. (Have JWs ever preached in a nudist colony?) Yet we have so many people who have renounced financial comfort so as to “have a greater share in the ministry” that when I see it elsewhere, it resonates no less than the homeschooling. I count as a friend today someone whose pursuit of a full-time ministry within Jehovah’s Witnesses triggered estrangement from his unbelieving oil baron family. “Look, Eric! Texas tea!” I call his attention to any gas station that we pass. The book that became the movie is not autobiographical. “I got interested in the wife of a good friend of my parents and ... [realized] it might be better to write about it than to do it,” he told the online publication Thoughtcat in 2006. Yet much of it was his life—his remoteness from his wealthy connected parents, for example, along with their world that he found so superficial. His relationship with his heart specialist dad was “reasonably bad,” he said, and with his socialite mom, he “was always looking for crumbs of approval.” He had figured he might get a considerable number of those crumbs with the publication of his book, for she was an avid reader who might boast “My son is an author!” but he didn’t—probably the skewering of her lifestyle had something to do with it. Still, whether you give up every dime or not—you don’t have to do it just for the sake of doing it. The ministry of the apostle Paul caused him to know both “how to have an abundance and how to do without.” (Philippians 4:12) He knew and was comfortable in both places. This fellow was good at doing without, but he seems to have panicked at having an abundance. Sometimes you have to renounce your past. Sometimes in doing so, you swing too far the other way. Maybe it was a starving artist kind of thing. He even made a cliche over it: “The penniless author has always been the stereotype that works for me. . . . When in doubt, be down and out.” But not for any romantic reason—he pushed back at that notion. “We hope to make the point that the creative process is really a defense mechanism on the part of artists — that creativity is not a romantic notion.” It’s not like he would recommend it to others, or maybe even to himself. It is more like he felt driven to it, half against his will. I think of how so many comedians developed and honed their comedy as a means of defendIng themselves from school-age bullies. There is even a video that suggests that. A character from one of his other books—he wrote eight—an alcoholic painter, says: “What’s important for me is that I keep doing it, keep painting, and hold on to that feeling which goes along with putting the paint of the canvas,” he wrote. “It’s all I have and all I need.” This, too, resonates with me, a fellow who imagines himself a writer—and inherits the pluses along with the minuses. “Lots of people momentarily embrace the idea of leaving the rat race, like the characters in The Graduate,” said one obit writer. “Mr. Webb [and his wife] did it, with all the consequences it entailed. If they regretted the choice, they did not say so.” And, “Webb has such an easygoing charm about him, such a friendly and sincere presence,” another wrote years prior. This also resonates with me, who—no, that is going too far. In the dog park I constantly have to apologize for my dog, who gets grouchy in his old age, “just like me.” As though to get in the final word, the condensed obituary in TheWeek Magazine read: “The Graduate author who ran from success” Did he? Or is it that they can only imagine their own definition of success there at TheWeek?

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    • Anna

      Anna 2,677

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    • folens  »  misette

      Coucou Misette merci pour ce bon travail de recherches. Bon weekend . Michel

      · 0 replies
    • folens  »  Eric Ouellet

      Hello Eric, merci pour ce bon sujet. Bonne journée Michel
      Le bombix et la soie.pps
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    • folens  »  misette

      Hello Misette merci pour tes partages. Bonne journée. Michel
      lettre aux locataires.pps
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    • Randy Lee Manning  »  Kick_Faceinator

      Why is the picture, above left, a picture of Bill Gates? And not your picture Kick?
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    • Eric Ouellet

      Avons-nous déjà eu une interrogation intérieure sur la force de notre foi?
      Vous ĂȘtes vous dĂ©jĂ  demandĂ© cette question?
      « Est-ce que Jéhovah voudra me sauver pendant la grande tribulation ? »
       L’apĂŽtre Paul a expliquĂ© que, pour rester en vie, la foi est une qualitĂ© trĂšs importante Ă  cultiver .
      Il a dit : « Sans la foi il est impossible de plaire Ă  JĂ©hovah. » (HĂ©breux 11:6) Cela peut sembler Ă©vident, mais en fait, comme on l’apprend en 2 Thessaloniciens 3:2, tous n’ont pas la foi. Ces 2 versets nous aident Ă  comprendre Ă  quel point c’est important de renforcer notre foi.
      L’apĂŽtre Pierre a dit qu’il faut avoir une foi « Ă©prouvĂ©e » qui veut dire que nous devons sans cesse cultiver la foi. (lire 1 Pierre 1:7) 
      Puisque la grande tribulation est trĂšs proche, nous voulons faire partie « de ceux qui ont foi » pour ĂȘtre sauvĂ©s. (HĂ©breux 10:39) Nous devons donc faire des efforts pour renforcer notre foi. Nous voulons ĂȘtre parmi ceux qui seront rĂ©compensĂ©s quand JĂ©sus Christ, notre Roi, sera rĂ©vĂ©lĂ©. Alors, comme l’homme qui a suppliĂ© JĂ©sus pour avoir plus de foi, nous aussi nous pouvons demander : « Aide-moi lĂ  oĂč j’ai besoin de foi ! » (Marc 9:24) Ou, comme les apĂŽtres, demandons : « Donne-nous davantage de foi. » (Luc 17:5)
      La foi est tellement importante que JĂ©hovah nous a donnĂ© beaucoup d’exemples de foi dans la Bible. Ils ont Ă©tĂ© Ă©crits « pour notre instruction ». (Romains 15:4) Les exemples d’Abraham, de Sara, d’Isaac, de Jacob, de MoĂŻse, de Rahab, de GĂ©dĂ©ĂŽn, de Baraq et de beaucoup d’autres nous encouragent Ă  renforcer notre propre foi. (HĂ©breux 11:32-35).
      Nous avons de formidables exemples de foi parmi nos frùres et sƓurs.
      La Bible nous parle d’Élie. En mĂ©ditant sur son exemple, remarque 5 situations oĂč il a montrĂ© qu’il avait une foi forte en JĂ©hovah. 1) Quand il a annoncĂ© Ă  Ahab que JĂ©hovah allait provoquer une sĂ©cheresse, il lui a dit avec confiance : « Aussi vrai que JĂ©hovah le Dieu d’IsraĂ«l est vivant, il n’y aura ni rosĂ©e ni pluie. » (1 Rois 17:1) 2) Il Ă©tait convaincu que JĂ©hovah donnerait Ă  lui et Ă  d’autres ce qu’il leur faudrait pendant la sĂ©cheresse. (1 Rois 17:4, 5, 13, 14) 3) Il Ă©tait sĂ»r que JĂ©hovah pouvait ressusciter le fils d’une veuve. (1 Rois 17:21) 4) Il n’a pas doutĂ© que le feu de JĂ©hovah allait brĂ»ler son sacrifice sur le mont Carmel. (1 Rois 18:24, 37) 5) Alors qu’il ne commençait mĂȘme pas Ă  pleuvoir, il a dit Ă  Ahab avec confiance : « Monte, mange et bois, car il y a le bruit d’une pluie torrentielle. » (1 Rois 18:41) AprĂšs avoir Ă©tudiĂ© ces situations, demandons-nous : « Ma foi est-elle aussi forte que celle d’Élie? »
      Pour avoir de la foi, il ne suffit pas d’en vouloir. De plus, la foi fait partie de l’esprit saint de JĂ©hovah. (Galates 5:22) Donc, pour renforcer notre foi, il faut prier pour recevoir plus d’esprit saint, comme JĂ©sus l’a conseillĂ©. Il a promis que JĂ©hovah « donnera de l’esprit saint Ă  ceux qui le lui demandent ». (Luc 11:13)
      Il faut prier pour recevoir plus d’esprit saint, comme JĂ©sus l’a conseillĂ©.
      Quand on a une foi forte en JĂ©hovah, on doit l’entretenir. On peut comparer la foi Ă  un feu. Quand on allume un feu, les flammes sont trĂšs fortes. Pourtant, si on n’ajoute pas de bois, le feu s’éteint, et il reste des cendres froides. Par contre, si on ajoute rĂ©guliĂšrement du bois, le feu peut continuer de brĂ»ler. C’est pareil avec notre foi. Si nous continuons de lire et d’étudier la Bible tous les jours, notre amour pour la Bible et pour JĂ©hovah grandit. En faisant cela, nous entretenons et nous renforçons notre foi.
      Que peux-tu faire pour renforcer et entretenir ta foi ?
       (lire Jacques 1:25 ; 2:24, 26)
      L’apĂŽtre Paul a dit que les chrĂ©tiens peuvent avoir « un Ă©change d’encouragements, chacun Ă©tant encouragĂ© grĂące Ă  la foi de l’autre ». (Romains 1:12) Qu’est-ce que cela signifie ? Quand nous passons du temps avec nos frĂšres et sƓurs, la foi de chacun de nous est renforcĂ©e par la foi des autres. C’est particuliĂšrement vrai quand nous passons du temps avec ceux qui ont une foi « Ă©prouvĂ©e ». (Jacques 1:3) Les mauvais amis dĂ©truisent notre foi, mais les amis bien choisis la renforcent. (1 Corinthiens 15:33) C’est pour cela qu’il faut assister rĂ©guliĂšrement aux rĂ©unions. Pendant les rĂ©unions, nous pouvons nous encourager les uns les autres. (lire HĂ©breux 10:24, 25) De plus, l’enseignement que nous y recevons renforce notre foi. La Bible dit que « la foi naĂźt de ce qu’on a entendu ». (Romains 10:17) Alors demande-toi : « Est-ce que les rĂ©unions chrĂ©tiennes sont une bonne habitude dans notre vie.
      Quand nous voyons comment JĂ©hovah nous aide et comment il rĂ©pond Ă  nos priĂšres, notre foi en lui augmente. C’est arrivĂ© Ă  Caleb et JosuĂ©. Ils ont montrĂ© qu’ils avaient foi en JĂ©hovah quand ils ont espionnĂ© la Terre promise. Avec le temps, chaque fois qu’ils ont vu comment JĂ©hovah les aidait, leur foi est devenue plus forte. JosuĂ© a pu dire avec confiance aux IsraĂ©lites : « Pas une parole n’a failli (n’a Ă©chouĂ©) de toutes les bonnes paroles que vous a dites JĂ©hovah votre Dieu. » Il a dit plus tard : « Craignez JĂ©hovah et servez-le avec intĂ©gritĂ© et avec vĂ©ritĂ©. » Puis il a ajoutĂ© : « Moi et ma maisonnĂ©e (ceux qui habitent dans ma maison), nous servirons JĂ©hovah. » (JosuĂ© 23:14 ; 24:14, 15) Quand nous avons confiance en JĂ©hovah et quand nous le voyons nous aider personnellement, notre foi devient plus forte. (Psaume 34:8)
      Le disciple Jacques a dit : « Je te montrerai ma foi par mes Ɠuvres. » (Jacques 2:18) 
      Les chrĂ©tiens qui font tout leur possible dans la prĂ©dication montrent qu’ils ont une foi forte.
      La prédication est un excellent moyen de prouver notre foi. Pourquoi? 
      Quand nous prĂȘchons, nous montrons que nous sommes sĂ»rs que la fin est proche et qu’« elle ne sera pas en retard ». (Habaqouq 2:3) Pour savoir si notre foi est forte, demandons-nous : « Est-ce que prĂȘcher est vraiment important pour moi ? Est-ce que je fais tout mon possible pour parler de JĂ©hovah aux gens ? Est-ce que je cherche des occasions de faire plus dans le service pour JĂ©hovah ? » (2 Corinthiens 13:5) Montrons que notre foi est forte en faisant « la dĂ©claration publique pour le salut », c’est-Ă -dire en prĂȘchant la bonne nouvelle. (lire Romains 10:10)
      Nous montrons aussi notre foi quand nous rĂ©sistons aux difficultĂ©s de la vie de tous les jours. Si nous sommes malades, dĂ©couragĂ©s, pauvres, ou si nous avons d’autres problĂšmes, nous devons avoir foi que JĂ©hovah et JĂ©sus nous aideront « au bon moment ». (HĂ©breux 4:16) Nous montrons notre foi en JĂ©hovah quand nous lui demandons de l’aide. JĂ©sus a dit que nous pouvons demander Ă  JĂ©hovah de nous donner « notre pain pour le jour selon les besoins du jour ». (Luc 11:3) Des rĂ©cits bibliques prouvent qu’il peut nous donner tout ce qu’il nous faut. Par exemple, pendant une grave sĂ©cheresse en IsraĂ«l, JĂ©hovah a donnĂ© Ă  Élie de l’eau et de la nourriture. La Bible raconte : « Les corbeaux lui apportaient du pain et de la viande le matin, du pain et de la viande le soir, et il buvait au ouadi (Ă  la riviĂšre). » (1 Rois 17:3-6) Nous avons foi que JĂ©hovah peut nous donner Ă  nous aussi ce dont nous avons besoin.
      Nous sommes sĂ»rs que, si nous appliquons les principes bibliques, nous pourrons nourrir notre famille. En Asie, Rebecca, une sƓur mariĂ©e, explique comment elle et sa famille ont appliquĂ© les principes de Matthieu 6:33 et de Proverbes 10:4. Elle raconte : « Mon mari sentait que son travail Ă©tait un danger pour notre amitiĂ© avec JĂ©hovah. Alors il a laissĂ© son travail. Mais nous avions 4 enfants Ă  nourrir. Nous avons donc dĂ©cidĂ© de vendre des sucreries que nous faisions nous-mĂȘmes. » GrĂące Ă  leurs efforts, ils ont toujours gagnĂ© assez d’argent pour s’occuper des besoins de leur famille. Rebecca dit : « Nous avons vu que JĂ©hovah ne nous a jamais abandonnĂ©s. Nous avons toujours eu de quoi manger. » As-tu dĂ©jĂ  vĂ©cu une situation semblable qui a renforcĂ© ta foi ?
      Nous pouvons ĂȘtre sĂ»r qu’en appliquant les principes bibliques, nous pourrons nourrir notre famille.
      Ne doutons jamais que JĂ©hovah nous aidera si nous lui obĂ©issons. Paul a citĂ© ces paroles d’Habaqouq : « Le juste vivra en raison de la foi. » (Galates 3:11 ; Habaqouq 2:4) C’est pour cela que nous devons avoir une foi forte en JĂ©hovah, Celui qui peut vraiment nous aider. 
      D’aprĂšs l'apĂŽtre Paul, JĂ©hovah peut, en agissant en nous avec sa puissance, faire beaucoup plus que ce que nous demandons ou imaginons. (ÉphĂ©siens 3:20) Nous faisons tout notre possible pour faire la volontĂ© de JĂ©hovah. Mais nous savons aussi que nous avons des limites. Alors nous sommes trĂšs heureux que JĂ©hovah soit avec nous et qu’il bĂ©nisse tous nos efforts.
      Que ressentons-nous Ă  prĂ©sent sur la qualitĂ© de la foi? Nous avons peut-ĂȘtre envie de demander comme les apĂŽtres : « Donne-nous davantage de foi. » (Luc 17:5) JĂ©sus a rĂ©pondu Ă  ses apĂŽtres d’une façon particuliĂšre Ă  la PentecĂŽte de l’annĂ©e 33. Ce jour-lĂ , ils ont reçu l’esprit saint et ils ont Ă©tĂ© capables de mieux comprendre le projet de JĂ©hovah. Cela a renforcĂ© leur foi. Qu'elle fut le rĂ©sultat?
      Ils ont commencé la plus grande activité de prédication jamais faite auparavant. (Colossiens 1:23) 
      Pouvons-nous espérer que Jéhovah réponde à nos priÚres quand nous lui demandons plus de foi ? 
      Oui, puisque nous le prions « selon sa volonté ». (1 Jean 5:14)
      Si nous avons totalement confiance en Jéhovah, il sera content de nous. Il répondra à nos priÚres pour avoir plus de foi. Alors, notre foi deviendra plus forte, et nous serons acceptés pour recevoir les bienfaits du Royaume de Dieu. (Hébreux 11 : 1)(Mathieu 17 :20)
      La foi est la certitude absolue que l'ont espÚre évidente de réalités invisibles. C'est en raison d'une telle foi, en effet que les hommes du passé ont reçu un témoignage favorable venant de Jéhovah le Seul vrai Dieu.
      Ayez une foi aussi gros qu'un grain de mourtarde car aucune obstacles de ce systÚme de chose ne pourra vous atteindre, nous serons inébranlable par notre force de la foi.

      · 0 replies
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