Aristotle Categorized Species as Immutable, the Theory of...

Aristotle noted three characteristics of his concept of species. First, each species is a whole. It is comprehensive, representative of all the objects embraced within it, and any one of these objects may be used as an example of all others. The species tree, for example, embraces all trees whether they are used for timber or for firewood; and any given tree may exemplify the species which includes all trees. Second, any one species comprises objects which have common or identical elements o...

 Heterogametic Sex Hypothesis

In mammals, including humans, sex is generally determined by the X and Y chromosomes. If a baby has a pair of X chromosomes, she’s a girl. If the baby inherits an X chromosome and a Y chromosome, he’s a boy. In birds, however, the situation is reversed. Female birds have a pair of unlike sex chromosomes while males have the like pair. (In this sort of sex-determination system, scientists use the letters W and Z, and talk about a ZW pair for female birds and a ZZ pair for males.) The “...

 Nuestra Piel es Una Gran Página en Blanco

Nuestra piel es una gran página en blanco; el cuerpo, un libro. El tiempo va escribiendo poco a poco su historia en las caras, en los brazos, en los vientres, en los sexos, en las piernas. Recién llegados al mundo, nos imprimen en la tripa una gran «O», el ombligo. Después, van apareciendo lentamente otras letras. Las líneas de la mano. Las pecas, como puntos y aparte. Las tachaduras que dejan los médicos cuando abren la carne y luego la cosen. Con el paso de los años, las cicatrices,...

 Quantifying Animal Farmed Animal Suffering with Neuron Co...

The question of what weight to give to human interests and to nonhuman animal interests is difficult.67 Humans are literally outweighed by farmed animals: land-based farmed animals have 70 percent more biomass than all humans.68 Land-based farmed animals also outnumber humans greatly, by a factor of three to one, with 25 billion chickens, 1.5 billion cattle, 1 billion sheep, and 1 billion pigs alive at any one time; farmed fish outnumber us, at a very rough estimate, ten to one, with around 1...

 How the Human's Short Lifespan Influences Their Behavior

Humans are the most adaptable and ambitious people among the common races. They have widely varying tastes, morals, and customs in the many different lands where they have settled. When they settle, though, they stay: they build cities to last for the ages, and great kingdoms that can persist for long centuries. An individual human might have a relatively short life span, but a human nation or culture preserves traditions with origins far beyond the reach o f any single human’s memory....

 This is Real

This is real. Your eyes reading this text, your hands, your breath, the time of day, the place where you are reading this—these things are real. I’m real too. I am not an avatar, a set of preferences, or some smooth cognitive force; I’m lumpy and porous, I’m an animal, I hurt sometimes, and I’m different one day to the next. I hear, see, and smell things in a world where others also hear, see, and smell me. And it takes a break to remember that: a break to d...

 The Car Example for OOP

The `Car extends Vehicle` or `Duck extends Bird` type of tutorial obscures more than it illuminates. In good OO programming, we don’t make class hierarchies in order to satisfy our inner Linnaeus. We make class hierarchies in order to simplify the code by allowing different parts of it to be changed independently of each other, and to eliminate duplication (which comes to the same thing). Without any context as to what the code needs to accomplish, you can’t make a judgment about whether...

 Philosophers are "Loafers"

We were not originally made to be learned; we have become so perhaps by a sort of abuse of our organic faculties, and at the expense of the State, which nourishes a host of loafers whom vanity has adorned with the name of “philosophers.” Nature created us all solely to be happy—yes, all, from the crawling worm to the eagle that soars out of sight in the clouds. That is why she has given all animals some share of natural law, a share of greater or less delicacy according to the needs of ...

 Humans Trained Themselves in Symbolic Thought

From animals to man, the transition is not violent, as good philosophers will admit. What was man before the invention of words and the knowledge of tongues? An animal of his species, who, with much less native instinct than the others, whose king he then considered himself to be, could not be distinguished from the ape and from the rest, except as the ape itself differs from the other animals; which means, by a face giving promise of more intelligence. Reduced to the bare “intuitive knowle...

 Evolutionary Origins of Play

There are several kinds of speculation about the origins of play: (a) The first holds that play originates as a mutation and therefore an amelioration of dangerous adaptational conJicts. According to John Allman in Evolving Brains, this play mutation constitutes a pre-existing genetic function. (b) Some scholars claim the most fundamental conJict arises between dangerous and mutually threatening opponents. In studies of such conJicts, 80 percent of the time creatures from ants to mammals ac...