Uploaded on Mar 21, 20089-11 Chile (september 11 1973)

Dr. Bronowski thought that the uncertainty principle should therefore be called the principle of tolerance. Pursuing knowledge means accepting uncertainty. Heisenberg's principle has the consequence that no physical events can ultimately be described with absolute certainty or with "zero tolerance," as it were. The more we know, the less certain we are.

Some philosophers before Locke had suggested that it would be good to find the limits of the Understanding, but what Locke does is to carry out this project in detail. In the four books of the Essay Locke considers the sources and nature of human knowledge. Book I argues that we have no innate knowledge. (In this he resembles Berkeley and Hume, and differs from Descartes and Leibniz.) So, at birth, the human mind is a sort of blank slate on which experience writes. In Book II Locke claims that ideas are the materials of knowledge and all ideas come from experience. The term 'idea,' Locke tells us "…stands for whatsoever is the Object of the Understanding, when a man thinks" (Essay I, 1, 8, p. 47). Experience is of two kinds, sensation and reflection. One of these - sensation - tells us about things and processes in the external world. The other - reflection - tells us about the operations of our own minds. Reflection is a sort of internal sense that makes us conscious of the mental processes we are engaged in. Some ideas we get only from sensation, some only from reflection and some from both.

Informative and compelling video about the Nocebo Effect

TOK Subject Guide

Since 1955, The Journal of Irreproducible Results has offered "spoofs, parodies, whimsies, burlesques, lampoons and satires" about life in the laboratory. Among its greatest hits: "Acoustic Oscillations in Jell-O, With and Without Fruit, Subjected to Varying Levels of Stress" and "Utilizing Infinite Loops to Compute an Approximate Value of Infinity." The good-natured jibes are a backhanded celebration of science. What really goes on in the lab is, by implication, of a loftier, more serious nature.

It has been jarring to learn in recent years that a reproducible result may actually be the rarest of birds. Replication, the ability of another lab to reproduce a finding, is the gold standard of science, reassurance that you have discovered something true. But that is getting harder all the time. With the most accessible truths already discovered, what remains are often subtle effects, some so delicate that they can be conjured up only under ideal circumstances, using highly specialized techniques.

In The Optimism Bias: A Tour of the Irrationally Positive Brain, Tali Sharot argues that we have a neurobiological basis for imagining a positive future. "Humans," she writes, "do not hold a positivity bias on account of having read too many self-help books. Rather, optimism may be so essential to our survival that it is hardwired into our most complex organ, the brain."

In the last few years, it's become increasingly clear that food companies engineer hyperprocessed foods in ways precisely geared to most appeal to our tastes. This technologically advanced engineering is done, of course, with the goal of maximizing profits, regardless of the effects of the resulting foods on consumer health, natural resources, the environment or anything else. But the issues go way beyond food, as the City University of New York professor Nicholas Freudenberg discusses in his new book, "Lethal but Legal: Corporations, Consumption, and Protecting Public Health." Freudenberg's case is that the food industry is but one example of the threat to public health posed by what he calls "the corporate consumption complex," an alliance of corporations, banks, marketers and others that essentially promote and benefit from unhealthy lifestyles.

"Crime dramas frequently depict detectives interrogating suspected criminals under bright lights to get the truth out of them. Now, a new study may lend credence to this tactic, as it suggests human emotion - both positive or negative - is experienced more intensely under bright lights."

"TOK is an invitation to explore how we know what we claim to know? It has a particular flavor. The individual knower is not especially privileged and not placed at the center of things. TOK is not a vehicle for a solpsistic, epistemic quest. "

"Before his untimely death in 1987 at age 45, Cecil Youngfox had established himself as one of Canada's leading native artists, renowned for his vivid, sensitive images of native cultural traditions. Today, his strong, imaginative vision remains as strong as ever, drawing the respect and interest of private and public collectors throughout the world. Mr. Youngfox was born in 1942 in Blind River, Ontario of Ojibway and Metis parents. Among the many honours bestowed on him, Mr. Youngfox received the Aboriginal Order of Canada for his work in preserving his native heritage."

"Cecil Youngfox was raised in Blind River, a small community in northern Ontario. He has lived in Greenwhich Village, New York, attended Newman Theological College in Alberta and studied art in Vancouver. His art had been a spare time activity until he was able to open up a studio in Toronto and earn enough to support himself."

"A weekly show where knowledge junkies get their fix of trivia-tastic information. This week we have the incredibly knowledgeable Michael Stevens, from Vsauce, to look at some common inaccuracies found in scientific illustrations. "

"Dennis Hlynsky, a film and animation professor at the Rhode Island School of Design, creates videos at the intersection of art and science. Hlynsky transforms ordinary footage of birds and insects into ethereal illustrations by digitally tracing the paths they travel.   To see more work from Hlynsky, visit his Vimeo channel, which features over 90 beautiful videos. "

An investigation into critical thinking