In his study Samuel Johnson, Joseph Wood Krutch takes this line when he says that what Aristotle really means by his theory of catharsis is that our evil passions may be so purged by the dramatic ritual that it is `` less likely that we shall indulge them through our own acts ''.

Another theory says that the name " Dada " came during a meeting of the group when a paper knife stuck into a French-German dictionary happened to point to ' dada ', a French word for ' hobbyhorse '.

The third theory says that humans indirectly caused the extinction of diprotodonts, by destroying the ecosystem on which they depended.

He says in this theory that it might have been Archbishop Andreas Sunesøn's personal ecclesiastical banner or perhaps even the flag of Archbishop Absalon, based on his tireless efforts to expand Christianity to the Baltic countries.

He says that the view that mind is an epiphenomenon of brain activity is not consistent with evolutionary theory, because if mind were functionless, it would have disappeared long ago, as it would not have been favoured by evolution.

The well-known historian of physics, C. P. Snow, says about him, " If Fermi had been born a few years earlier, one could well imagine him discovering Rutherford's atomic nucleus, and then developing Bohr's theory of the hydrogen atom.

But the theory refers only to aggregate wealth and says nothing about the distribution of wealth ; in fact there may be significant losers, in particular among the recently protected industries with a comparative disadvantage.

It says that for any first-order theory T with a well-orderable language, and any sentence S in the language of the theory, there is a formal proof of S in T if and only if S is satisfied by every model of T ( S is a semantic consequence of T ).

" Austrian School economist Hans-Hermann Hoppe says that " the 1849 article " The Production of Security " is probably the single most important contribution to the modern theory of anarcho-capitalism.

Electronic band theory ( a branch of physics ) says that a charge will flow if states are available into which electrons can be excited.

The law of retaliation ( lex talionis ) is a military theory of retributive justice, which says that reciprocity should be equal to the wrong suffered ; " life for life, wound for wound, stripe for stripe.

Conquest says that the application of party theory to the Kazakhs, and to a lesser extent to the other nomad peoples, amounted economically to the imposition by force of an untried stereotype on a functioning social order, with disastrous results.

One theory says that Kubla Khan is about poetry and the two sections discuss two types of poems.

The labor theory as an explanation for value contrasts with the subjective theory of value, which says that value of a good is not determined by how much labor was put into it but by its usefulness in satisfying a want and its scarcity.

Standard theory says that, if set above the equilibrium price, more labor will be willing to be provided by workers than will be demanded by employers, creating a surplus of labor, i. e., unemployment.

So the basic theory says that raising the minimum wage helps workers whose wages are raised, and hurts people who are not hired ( or lose their jobs ) because companies cut back on employment.

Minsky says that the biggest source of ideas about the theory came from his work in trying to create a machine that uses a robotic arm, a video camera, and a computer to build with children's blocks.

While proposing the theory, Beck says that his scenario may be regarded as Cumontian in two ways.

An anthropological theory says they descended from the Old Cordilleran Culture, which moved south from the Rocky Mountains and west in Nez Perce lands.

The theory is complicated by the etymology of the name Svafrþorinn ( þorinn meaning " brave " and svafr means " gossip ") ( or possibly connects to sofa " sleep "), which Rudolf Simek says makes little sense when attempting to connect it to Njörðr.

Thomas Gold a professor of astronomy suggested a " garbage theory " for the origin of life, the theory says that life on Earth might have spread from a pile of waste products accidentally dumped on Earth long ago by extraterrestrials.

To use an example from Milton Friedman, if a theory that says that the behavior of the leaves of a tree is explained by their rationality passes the empirical test, it is seen as successful.

According to Charles Darwin's 1859 theory of natural selection, features such as camouflage evolved by providing individual animals with a reproductive advantage, enabling them to leave more offspring, on average, than other members of the same species.

They are noted for their association with Charles Darwin, whose observation of animals here during the voyage of the Beagle led to his formation of the theory of natural selection as a means of evolution.

According to this theory, living beings were classified on an ideal pyramid that represented the simplest animals on the lower levels, with complexity increasing progressively toward the top, occupied by human beings.

Lorenz developed an interesting theory of the evolution of animal communication based on his observations of the nature of fixed action patterns and the circumstances in which animals emit them.

Haeckel portrays a concrete demonstration of his Biogenetic Law through his ‘ Gastrea ’ theory, in which he argues that the early cup-shaped gastrula stage of development is a universal feature of multi-celled animals.

Extinction of animals and plants caused by human actions may go as far back as the late Pleistocene, over 12, 000 years BP, but there is no direct evidence for this theory and it is more likely abrupt climate change played a much higher role in the extinction of larger mammals.

According to Agassiz ’ s theory of polygenism animals, plants and humans were all created in “ special provinces ” each having distinct populations of species created in and for that province.

In his treatise De pictura ( 1435 ) he explains the theory, of the accumulation of people, animals, and buildings, which create harmony amongst each other, and " hold the eye of the learned and unlearned spectator for a long while with a certain sense of pleasure and emotion ".

The theory of recapitulation, also called the biogenetic law or embryological parallelism — and often expressed as " ontogeny recapitulates phylogeny "— is a biological hypothesis that in developing from embryo to adult, animals go through stages resembling or representing successive stages in the evolution of their remote ancestors.

The theory proposed considered to be the most likely evolution of running is of early humans ' developing as endurance runners from the practice of persistence hunting of animals, the activity of following and chasing until a prey is too exhausted to flee, succumbing to " chase myopathy " ( Sears 2001 ), and that human features such as the nuchal ligament, abundant sweat glands, the Achilles tendons, big knee joints and muscular glutei maximi, were changes caused by this type of activity ( Bramble & Lieberman 2004, et al .).

The theory as first proposed used comparitative physiological evidence and the natural habits of animals when running, indicating the likelihood of this activity as a successful hunting method.

" The argument was that the theory of the descent of man from a lower order of animals was now established by the preponderance of scientific thought, and that the prohibition of the teaching of such theory was a violation of the legislative duty to cherish science.

We are not able to see how the prohibition of teaching the theory that man has descended from a lower order of animals gives preference to any religious establishment or mode of worship.

" Singer argued that, although there may be differences between animals and humans, they share the capacity to suffer, and we must give equal consideration to that suffering ; any position that allows similar cases to be treated in a dissimilar fashion fails to qualify as an acceptable moral theory.

In paleolithic times, mostly animals were painted, in theory ones that were used as food or represented strength, such as the rhinoceros or large cats ( as in the Chauvet Cave ).

In fact, the evolution of all eukaryotes ( plants, animals, fungi, and protists ) is believed under the endosymbiotic theory to have resulted from a symbiosis between various sorts of bacteria.

Though a variety of explanations have been proposed for human hairlessness, the best-supported theory involves improved cooling through perspiration ; while fur helps cool inactive animals, hairless skin that sweats vigorously is much better at cooling humans who generate body heat through activity.

One influential theory held that the biblical Ararat was striped with varying climatic zones, and as climate changed, the associated animals moved as well, eventually spreading to repopulate the globe.

Thorndike was able to create a theory of learning based on his research with animals.

The very long cecum of some herbivorous animals, such as found in the horse or the koala, supports this theory.

This technique is currently the basis for cloning animals ( such as the famous Dolly the sheep ), and in theory could be used to clone humans.

One theory for this is the " 4th trimester theory " which notes that most animals are born with significant mobility, but humans are relatively helpless at birth, and suggests that there may have once been a fourth trimester, but that children began to be born earlier, evolutionarily, to accommodate the development of larger heads and brains and allow them to pass through the birth canal and this leaves them with partially undeveloped digestive systems.