Verified It can refer to the theoretical or practical understanding of a subject. He saw knowledge as a case of a family resemblance.
Knowledge is a familiarity with someone or something, which can include facts, information, descriptions, or skills acquired through experience or education. It can be implicit (as with practical skill or expertise) or explicit (as with the theoretical understanding of a subject); it can be more or less formal or systematic.[1] In philosophy, the study of knowledge is called epistemology; the phil
osopher Plato famously defined knowledge as "justified true belief." However, no single agreed upon definition of knowledge exists, though there are numerous theories to explain it. Knowledge acquisition involves complex cognitive processes: perception, communication, association and reasoning; while knowledge is also said to be related to the capacity of acknowledgment in human beings. The eventual demarcation of philosophy from science was made possible by the notion that philosophy's core was "theory of knowledge," a theory distinct from the sciences because it was their foundation… Without this idea of a "theory of knowledge," it is hard to imagine what "philosophy" could have been in the age of modern science. The definition of knowledge is a matter of ongoing debate among philosophers in the field of epistemology. The classical definition, described but not ultimately endorsed by Plato,[3] specifies that a statement must meet three criteria in order to be considered knowledge: it must be justified, true, and believed. Some claim that these conditions are not sufficient, as Gettier case examples allegedly demonstrate. There are a number of alternatives proposed, including Robert Nozick's arguments for a requirement that knowledge 'tracks the truth' and Simon Blackburn's additional requirement that we do not want to say that those who meet any of these conditions 'through a defect, flaw, or failure' have knowledge. Richard Kirkham suggests that our definition of knowledge requires that the evidence for the belief necessitates its truth.[4]
In contrast to this approach, Wittgenstein observed, following Moore's paradox, that one can say "He believes it, but it isn't so," but not "He knows it, but it isn't so." [5] He goes on to argue that these do not correspond to distinct mental states, but rather to distinct ways of talking about conviction. What is different here is not the mental state of the speaker, but the activity in which they are engaged. For example, on this account, to know that the kettle is boiling is not to be in a particular state of mind, but to perform a particular task with the statement that the kettle is boiling. Wittgenstein sought to bypass the difficulty of definition by looking to the way "knowledge" is used in natural languages. Following this idea, "knowledge" has been reconstructed as a cluster concept that points out relevant features but that is not adequately captured by any definition. The development of the scientific method has made a significant contribution to how knowledge is acquired. To be termed scientific, a method of inquiry must be based on gathering observable and measurable evidence subject to specific principles of reasoning and experimentation.[13] The scientific method consists of the collection of data through observation and experimentation, and the formulation and testing of hypotheses.[14] Science, and the nature of scientific knowledge have also become the subject of Philosophy. As science itself has developed, knowledge has developed a broader usage which has been developing within biology/psychology—discussed elsewhere as meta-epistemology, or genetic epistemology, and to some extent related to "theory of cognitive development". Sir Francis Bacon, "Knowledge is Power"
Note that "epistemology" is the study of knowledge and how it is acquired. Science is "the process used everyday to logically complete thoughts through inference of facts determined by calculated experiments." Sir Francis Bacon was critical in the historical development of the scientific method; his works established and popularized an inductive methodology for scientific inquiry. His famous aphorism, "knowledge is power", is found in the Meditations Sacrae (1597).[15]
Until recent times, at least in the Western tradition, it was simply taken for granted that knowledge was something possessed only by humans — and probably adult humans at that. Sometimes the notion might stretch to (ii) Society-as-such, as in (e.g.) "the knowledge possessed by the Coptic culture" (as opposed to its individual members), but that was not assured either. Nor was it usual to consider unconscious knowledge in any systematic way until this approach was popularized by Freud.[16]
Other biological domains where "knowledge" might be said to reside, include: (iii) the immune system, and (iv) in the DNA of the genetic code. See the list of four "epistemological domains": Popper, (1975);[17] and Traill (2008:[18] Table S, page 31)—also references by both to Niels Jerne. Such considerations seem to call for a separate definition of "knowledge" to cover the biological systems. For biologists, knowledge must be usefully available to the system, though that system need not be conscious. Thus the criteria seem to be:
The system should apparently be dynamic and self-organizing (unlike a mere book on its own). The knowledge must constitute some sort of representation of "the outside world",[19] or ways of dealing with it (directly or indirectly). Some way must exist for the system to access this information quickly enough for it to be useful. Scientific knowledge may not involve a claim to certainty, maintaining skepticism means that a scientist will never be absolutely certain when they are correct and when they are not. It is thus an irony of proper scientific method that one must doubt even when correct, in the hopes that this practice will lead to greater convergence on the truth in general.
03/08/2018
The brain and the heart get a lot of attention, but we think the liver deserves way more time in the spotlight. This organ keeps your sugar levels constant, stores and releases vitamins and minerals into your body as needed, detoxifies your blood, and has a remarkable ability to regenerate. But a study uncovered another fascinating feature: It grows by day, and shrinks by night. And that's more than just a cool trick.
یہاں کچھ لوگ سوچتے کیا ہمارا جگر بڑا دکھ را
Scientists have known that animals follow a "body clock" that triggers regular cycles of function in their brains, organs, and even their cells. But while the liver is also beholden to this internal clock, its function may also depend on when you eat and when you exercise. "Many of them are also influenced by the rhythm of food intake and physical activity, and we wanted to understand how the liver adapts to these fluctuations," Ueli Schibler, professor emeritus at the Department of Molecular Biology the Université de Genève said in a press release.
مئی 2017 میں ایک تحقاتی نے اس پر اپنے رسرچ پیپرز شائع کیے جس میں انہوں نے یہ بات ثابت کی کہ
that the liver is very in tune with the body's clock. They studied mice and saw that their livers grew by nearly half during waking hours (which, for mice, is night), and shrunk back down to "normal" size at mousey bedtime.
Specifically, the researchers saw hepatocytes — the main kind of liver cell — growing while the mice were active at night. They credit this growth with the number of ribosomes (the organelles that produce the proteins required for various liver functions), which also fluctuates with the size of the cells. The more ribosomes, the better equipped the liver is to process food into protein and rid the body of toxins. As bedtime draws near, the liver cells start tagging and bagging those excess ribosomes, helping the liver shrink down to its resting size again.
22/07/2018
Dissection of Frog .
bY.
Muhammad Saqib
Facebook.com/MuhammadSaqibP07/
12/07/2018
Bora Bora, French Polynesia.......................
05/07/2018
27/10/2017
How many types of teeth ?
A. 2
B. 3
C. 4
D. 5
27/10/2017
The Level of Oxytocine harmone is increase During Sexual activity..This harmone is Also known as love Harmone... In Which Gender has Usually High Level Of Oxytocin?
Female
Male
24/10/2017
On July 20, 1969, Apollo 11 astronauts Neil Armstrong and Buzz Aldrin climbed down from the Eagle lunar module (leaving behind poor Michael Collins) to put the first footprints on the moon. That's the story, at least. A vocal minority believes that the moon landing was all an elaborate hoax filmed on a sound stage in Hollywood. Among their evidence is the fact that photographs and video footage don't show any stars in the sky. How could the Hollywood producers be so careless in their conspiracy? In fact, there's a pretty mundane explanation. The camera settings weren't adjusted to capture them.
If you wanted to take a picture of a friend in direct sunlight, you'd adjust your camera settings in two ways. You'd narrow the aperture, which keeps the light-collecting area on the lens small to avoid letting in too much light, the same reason your pupils constrict in bright sunlight. You'd also speed up the shutter speed, so the camera sensor would only let in light for a brief moment. If you wanted to take a picture of that same friend at night, you'd probably slow down the shutter speed and widen the aperture so you could let in enough light for a good shot.
But what if your friend was illuminated at nighttime? Then you'd have to choose what you wanted in your photo. If you wanted to include the stars in the sky, you'd need to make sure your friend stood extra still to avoid blurring the shot while the slow shutter and wide aperture let in enough light. If you kept the aperture small and the shutter speed fast, you'd capture a sharp, decently bright picture of your friend, but the sky would be dark because it wouldn't send enough light into the lens.
That's the trade-off the Apollo astronauts had to make. The sky on the moon is black as night not because it is night, but because there's no atmosphere to scatter the daylight the way ours does on Earth. But make no mistake, there is every bit as much sunlight at midday on the moon as there is on our home planet. That makes the lunar surface incredibly bright. The scenery on the moon was the most important thing to capture in the Apollo photographs, so the camera was adjusted to make the most out of that scenery. As a result, the relatively dim stars in the background didn't register in any of the shots. No hoax, just a trick of the camera lens.
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