24 JAN 2015 by ideonexus
Dyson VS Sagan on Nuclear Winter
I do not wish here to get into a technical argument about the details of nuclear winter. I will merely summarize my own struggles with the technical issues. I spent a few weeks in 1985 trying to make nuclear winter go away. The phrase "go away" here is used in the sense customary among scientists. To destroy a new theory, you try to find a simple situation where the theory predicts that something happens and you can prove that the same something does not happen. Then you say that the thing pr... 1 
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notes24 JAN 2015 by ideonexus
A Black Hole is a Star Forever Falling Inward
He talked to us about the new theory of black holes which he had then just worked out. The idea of a black hole was one of the most dramatic consequences of Einstein's theory of gravity. According to Einstein's equations, a massive star at the end of its life, when it has exhausted its nuclear fuel, continues to contract and grow smaller and denser under the influence of its own gravitation. After the nuclear fuel is used up, the star goes into a state of gravitational collapse. All parts of ... 1 notes
notes24 JAN 2015 by ideonexus
A Black Hole is a Star Forever Falling Inward
He talked to us about the new theory of black holes which he had then just worked out. The idea of a black hole was one of the most dramatic consequences of Einsteins theory of gravity. According to Einstein's equations, a massive star at the end of its life, when it has exhausted its nuclear fuel, continues to contract and grow smaller and denser under the influence of its own gravitation. After the nuclear fuel is used up, the star goes into a state of gravitational collapse. All parts of t...24 JAN 2015 by ideonexus
A Black Hole is a Star Forever Falling Inward
He talked to us about the new theory of black holes which he had then just worked out. The idea of a black hole was one of the most dramatic consequences of Einstein's theory of gravity. According to Einstein's equations, a massive star at the end of its life, when it has exhausted its nuclear fuel, continues to contract and grow smaller and denser under the influence of its own gravitation. After the nuclear fuel is used up, the star goes into a state of gravitational collapse. All parts of ...19 NOV 2013 by ideonexus
The Selfish Gene as a New Perspective on an Old Hypothesis
The selfish gene theory is Darwin's theory, expressed in a way that
Darwin did not choose but whose aptness, I should like to think, he
would instantly have recognized and delighted in. It is in fact a logical
outgrowth of orthodox neo-Darwinism, but expressed as a novel image.
Rather than focus on the individual organism, it takes a gene's-eye view
of nature. It is a different way of seeing, not a different theory. In the
opening pages of The Extended Phenotype, I explained this using the
me...
1 It is Darwin's theory, but a story told from the gene's point of view.
13 OCT 2013 by ideonexus
The Clock, Icon of Science
Philosophers were always looking for new handles on the universe—new
similes, new metaphors, new analogies. Despite their scorn for those who
cast the Creator of the Universe in man's image, the theologians never
ceased to scrutinize man's own handiwork as their clues to God. Now man
was a proud clockmaker, a maker of self-moving machines. Once set in
motion, the mechanical clock seemed to tick with a life of its own. Might
not the universe itself be a vast clock made and set in motion by t... 1 notes
notesThe first icon to replace religous icons in Western culture.
09 JUN 2012 by ideonexus
Science is Conservative
A discovery in science, or a new theory, even when it appears most unitary and most all-embracing, deals with some immediate element of novelty or paradox within the framework of far vaster, unanalysed, unarticulated reserves of knowledge, experience, faith, and presupposition. Our progress is narrow; it takes a vast world unchallenged and for granted. This is one reason why, however great the novelty or scope of new discovery, we neither can, nor need, rebuild the house of the mind very rapi... 1 notes
notesIt only reveals a very narrow part of reality, and we must accept that we cannot understand most of it, but we can know more and more.
29 MAR 2012 by ideonexus
Gravity Travels at the Speed of Light
Here's the rub. In Newton's theory of gravity, one body exerts a gravitational pull on another with a strength determined solely by
the mass of the objects involved and the magnitude of their separation. The strength has nothing to do with how long the objects
have been in each other's presence. This means that if their mass or their separation should change, the objects will, according to
Newton, immediately feel a change in their mutual gravitational attraction. For instance, Newton's theor... 1 notes
notesAccording to Einstein, overturning Newton.
31 JAN 2012 by ideonexus
The Dangerous Zealot
There is no great harm in the theorist who makes up a new theory to fit a new event. But the theorist who starts with a false theory and then sees everything as making it come true is the most dangerous enemy of human reason. 1 notes
notesChesterson describes the "theorist who starts with a false theory" and sees everything as supporting it as the most dangerous enemy of human reason. Sounds like religious believers.
08 JUL 2011 by ideonexus
Teaching Babies Science
But we also have some more direct evidence for the idea that children learn like scientists. Alison and Virginia Slaughter, one of her students, looked at three-year-old children who didn't yet fully understand belief—children who still said they had always thought that there were pencils in the candy box. Then, over the course of a few weeks, Virginia gave the children systematic evidence that their predictions were false. She told them firmly that they hadn't said pencils at all, they had... 1 notes
notesHaving children predict something and then systematically demonstrating how their prediction is false makes them more capable of understanding how beliefs work.
