Carl Sagan Placebo Medicine Quotes

When conventional medicine fails, when we must confront pain and death, of course we are open to other prospects for hope.
And, after all, some illnesses are psychogenic. Many can be at least ameliorated by a positive cast of mind. Placebos are dummy drugs, often sugar pills. Drug companies routinely compare the effectiveness of their drugs against placebos given to patients with the same disease who had no way to tell the difference between the drug and the placebo. Placebos can be astonishingly effective, especially for colds, anxiety, depression, pain, and symptoms that are plausibly generated by the mind. Conceivably, endorphins -the small brain proteins with morphine-like effects - can be elicited by belief. A placebo works only if the patient believes it's an effective medicine. Within strict limits, hope, it seems, can be transformed into biochemistry. ~ Carl Sagan

If we scrutinize 100,000 pictures, it's not surprising that occasionally we'll come upon something like a face. With our brains programmed for this from infancy, it would be amazing if we couldn't find one here and there. ~ Carl Sagan

The price we pay for anticipation of the future is anxiety about it ~ Carl Sagan

Our species has discovered a way to communicate through the dark, to transcend immense distances. No means of communication is faster or cheaper or reaches out farther. It's called radio. ~ Carl Sagan

The cosmic calendar compresses the local history of the universe into a single year. If the universe began on January 1st it was not until May that the Milky Way formed. Other planetary systems may have appeared in June, July and August, but our Sun and Earth not until mid-September. Life arose soon after. We humans appear on the cosmic calendar so recently that our recorded history occupies only the last few seconds of the last minute of December 31st ~ Carl Sagan

The absence of evidence is not the evidence of absence. ~ Carl Sagan

It seems madness to say, 'We're worried that they're going to become addicted to marijuana'
there's no evidence whatever that it's an addictive drug, but even if it were, these people are dying, what are we saving them from? ~ Carl Sagan

What if, despite all our pretense and disguise, it was necessary to appear in public with the person we loved most of all? Imagine this a prerequisite for social discourse on Earth. ~ Carl Sagan

But the brain does much more than just recollect it inter-compares, it synthesizes, it analyzes, it generates abstractions. The simplest thought like the concept of the number one has an elaborate logical underpinning. The brain has its own language for testing the structure and consistency of the world. ~ Carl Sagan

But you reassure yourself that at least here they are safe from baleen whales and oil slicks and cocktail sauce. ~ Carl Sagan

Imagine a room awash in gasoline, and there are two implacable enemies in that room. One of them has nine thousand matches. The other has seven thousand matches. Each of them is concerned about who's ahead, who's stronger. Well that's the kind of situation we are actually in. The amount of weapons that are available to the United States and the Soviet Union are so bloated, so grossly in excess of what's needed to dissuade the other, that if it weren't so tragic, it would be laughable. What is necessary is to reduce the matches and to clean up the gasoline. ~ Carl Sagan

We make our world significant by the courage of our questions and the depth of our answers ~ Carl Sagan

In addition to Ameslan, chimpanzees and other nonhuman primates are being taught a variety of other gestural languages. And it is just this transition from tongue to hand that has permitted humans to regain the ability-lost, according to Josephus, since Eden-to communicate with the animals. ~ Carl Sagan

Why is the half of humanity with a special sensitivity to the preciousness of life, the half untainted by testosterone poisoning, almost wholly unrepresented in defense establishments and peace negotiations worldwide? [blurb on Daniella Gioseffi's _Women on War_; quoted in Carol Lynn Pearson's _The Ghost of Eternal Polygamy_] ~ Carl Sagan

But the history of science - by far the most successful claim to knowledge accessible to humans - teaches that the most we can hope for is successive improvement in our understanding, learning from our mistakes, an asymptotic approach to the Universe, but with the proviso that absolute certainty will always elude us. We will always be mired in error. The most each generation can hope for is to reduce the error bars a little, and to add to the body of data to which error bars apply. The error bar is a pervasive, visible self-assessment of the reliability of our knowledge. ~ Carl Sagan

The immense distances to the stars and the galaxies mean that we see everything ins pace int he past, some as they were before the Earth came to be. Telescopes are time machines. ~ Carl Sagan

Russell commented that the development of such gifted individuals (referring to polymaths) required a childhood period in which there was little or no pressure for conformity, a time in which the child could develop and pursue his or her own interests no matter how unusual or bizarre. ~ Carl Sagan

But there was also a notable decline in many quarters of the world of jingoist rhetoric and puerile self-congratulatory nationalism. There was a sense of the human species, billions of tiny beings spread over the world, collectively presented with an unprecedented opportunity, or even a grave common danger. To many, it seemed absurd for the contending nation states to continue their deadly quarrels when faced with a nonhuman civilization of vastly greater capabilities. There was a whiff of hope in the air. ~ Carl Sagan

Science is an ongoing process. It never ends. There is no single ultimate truth to be achieved, after which all the scientists can retire. And because this is so, the world is far more interesting, both for the scientists and for the millions of people in every nation who, while not professional scientists, are deeply interested in the methods and findings of science. ~ Carl Sagan

the more people killed in a war, the less likely it was to occur, and the longer before you could witness it, just as violent storms occur less frequently than cloudbursts. Richardson ~ Carl Sagan

Not explaining science seems to me perverse. When you're in love, you want to tell the world. ~ Carl Sagan

The sky calls to us. If we do not destroy ourselves, we will one day venture to the stars. ~ Carl Sagan

The old appeals to racial, sexual and religious chauvinism to rabid nationalist fervor, are beginning not to work. ~ Carl Sagan

The Somnium makes clear to us, although it did not to all of Kepler's contemporaries, that "in a dream one must be allowed the liberty of imagining occasionally that which never existed in the world of sense perception." Science fiction was a new idea at the time of the Thirty Years' War, and Kepler's book was used as evidence that his mother was a witch. ~ Carl Sagan

Any civilization that doesn't develop space travel dies. ~ Carl Sagan

[T]he practice of superstition is so congenial to the multitude that, if they are forcibly awakened, they still regret the loss of their pleasing vision. Their love of the marvellous and supernatural, their curiosity with regard to future events, and their strong propensity to extend their hopes and fears beyond the limits of the visible world, were the principal causes which favoured the establishment of Polytheism. So urgent on the vulgar is the necessity of believing, that the fall of any system of mythology will most probably be succeeded by the introduction of some other mode of superstition ~ Carl Sagan

What is called for is an exquisite balance between two conflicting needs: the most skeptical scrutiny of all hypotheses that are served up to us and at the same time a great openness to new ideas. If you are only skeptical, then no new ideas make it through to you. On the other hand, if you are open to the point of gullibility and have not an ounce of skeptical sense in you, then you cannot distinguish useful ideas from the worthless ones. ~ Carl Sagan

After I give lectures-on almost any subject-I am often asked, "Do you believe in UFOs?" I'm always struck by how the question is phrased, the suggestion that this is a matter of belief and not evidence. I'm almost never asked, "How good is the evidence that UFOs are alien spaceships?" ~ Carl Sagan

In the littered field of discredited self-congratulatory chauvinisms, there is only one that seems to hold up, one sense in which we are special: Due to our own actions or inactions, and the misuse of our technology, we live at an extraordinary moment, for the Earth at least - the first time that a species has become able to wipe itself out. ~ Carl Sagan

In the fabric of space and in the nature of matter, as in a great work of art, there is, written small, the artist's signature. ~ Carl Sagan

Kepler's third or harmonic law states that the squares of the periods of the planets (the times for them to complete one orbit) are proportional to the cubes of their average distance from the Sun; the more distant the planet, the more slowly it moves, but according to a precise mathematical law: P2 = a3, where P represents the period of revolution of the planet about the Sun, measured in years, and a the distance of the planet from the Sun measured in astronomical units. ~ Carl Sagan