Thursday, June 22, 2017

Aristotle, the greatest scientist of the Greco-Roman civilization

Aristotle
In my biographical dictionary, 1000 great scientists (1996) I proposed an objective quantification of the importance of different scientists, using measures such as the number of lines assigned to each in encyclopedias in different languages, to avoid bias in favor of the fellow citizens. Subsequently, in an unpublished work (The Quantification of History and the Future of the West), I applied the same procedure to various branches of human creativity: science, philosophy, literature, fine arts, and music. In that study, six scientists were tied with the highest score: one Greek (Aristotle) ​​and five from the West (Descartes, Newton, Darwin, Freud and Einstein). We can therefore say that Aristotle was the greatest scientist of the Greco-Roman civilization.

Thursday, June 15, 2017

Is man a kingdom of nature?

Amount of information available to different species
Among all living species, there is a special one: ours. This has been said since antiquity, and has only been questioned in the last half century. Many biologists argue that the human species is one among many, that it cannot be considered superior to any of the others, either bacteria, insects, or other mammals.
There is, however, a quantitative and perfectly objective criterion that makes it possible to prove that the human species is unique, completely different from all others: the amount of information that each individual can handle.
For unicellular beings, the only information available to each individual is their own genome, which is easy to quantify: their bit value is approximately equal to twice the number of nucleotides in their genome. For viruses, from 10 to 50 kbits; for bacteria, up to 10 Mbits; for a unicellular eukaryote, up to 25 Mbits.
If we move to multicellular animals and plants, the size of the genome increases, and with it the amount of information it contains: about 200 Mbits for a nematode, up to several Gbits for vertebrates. For man it is estimated at about 6 Gbits, not much larger than the genomes of other mammals. In fact, the living being with the largest genome happens to be a fish.
In addition to the genome, vertebrates have a second source of information: their nervous system, especially the brain. The total amount of information contained in a brain is estimated at about 10 kbits for amphibians, 10 Gbits for reptiles, 200 Gbits for mammals.
Here man is unique: in proportion to the human body, our brain is larger than that of any other living species and is capable of storing no less than 10 Tbits (10 trillion bits), 50 times more than most mammals and a thousand times more than our own genome. It can be said that, with man, life crossed a critical point. For the first time in history, a single individual is able to reach such levels of information handling.
Five thousand years ago, with the invention of writing, man crossed a new critical point, a consequence of the previous one. We have become the only species with a third source of information, a memory external to our body. With the arrival of computers and Internet, this information has been made available to everybody and is still growing. Currently it is estimated that it has exceeded 100 exabits (100 quintillion bits, or 1020 bits: one followed by twenty zeros). Every human being, apart from what is contained in the brain, has access to extra information ten million times greater, as if we were connected with ten million brains apart from ours.
The attached figure summarizes this and combines (on a logarithmic scale) all sources of information available at any time for the species capable of handling most information, depending on the time elapsed from the origin of life to the apparition of the said species, in billions of years.
C.S.Lewis
Man is so different from all other species, so overwhelmingly dominant, that we should be considered a kingdom of nature. I have indicated in another post that, for better or worse, our effect on the rest of living beings (the biosphere), the atmosphere and the whole Earth is greater than that of all the other animals together. When biologists claim that man is a species like any other, that the history of life shows no progress in any direction, the least that can be said is that they don’t know what they are saying. Or perhaps they have been carried away by extra-scientific ideologies that try to denigrate man and deprive us of our dignity, so as to be able to kill us when we hinder (through abortion or euthanasia) or to manipulate us whenever some people wish it (see The abolition of man, by C.S.Lewis, 1943).
Manuel Alfonseca

Thursday, June 8, 2017

The debacle of determinism

Isaac Newton
By the end of the eighteenth century, Isaac Newton’s theory of universal gravitation was well established. As this theory makes it possible to predict very accurately the orbits of the bodies in the solar system, the French astronomer Pierre Simon de Laplace believed he had sufficient reasons to say the following:
An intelligence that knew all the forces that animate nature, as well as the respective situation of the beings that make it... could cover in a single formula the movements of the largest bodies of the universe and those of the lighter atom. Nothing would be uncertain and both the future and the past would be present before his eyes.
This assertion became the dogma of deterministic materialism, a philosophical (not scientific) doctrine asserting that only matter exists (taking the term broadly) and that the whole history of the universe is determined. Therefore there is no human freedom, nor intentionality, nor final causes in nature. There are just efficient causes.
Laplace’s statement can be expressed in more modern terms:
If we knew the position and the momentum of all the particles of the universe at a given instant, we could predict all their past and future development.

Thursday, June 1, 2017

Bell’s inequality and causality

Niels Bohr
Quantum Mechanics took shape about ninety years ago. During the twenties, Niels Bohr and Werner Heisenberg formulated the Copenhagen interpretation, which added to the mathematical formulation some additional considerations such as the following:
  • Physical systems with properties that can take concrete and opposing values ​​(such as direction of polarization or spin) in certain circumstances can be in a state where those properties do not take a defined value, but keep all the possibilities simultaneously open. For example, the direction of polarization of a photon can be simultaneously north-south and east-west. The spin of a particle can be both up and down.
  • The act of measuring one of these properties causes the collapse of the wave function, which means that the result of the measurement can only be one of the possible values. The wave function gives us the probability of obtaining each value.
  • It is possible to build a physical system formed by two or more interlaced particles with respect to some property, which means that if one of the particles collapses with a certain value, the other particle has no choice but to collapse with the other.

Thursday, May 25, 2017

A mathematical model for time travel

Welcome for time travellers
On May 2 2017, Newsweek published an article with this title:
Time travel is mathematically possible with mind-boggling model
You may well imagine that, with that title, the article will rather fall into the category of sensationalist papers on seemingly scientific issues. Indeed, in a quick reading of this article I have detected the following inaccuracies:

  1. The title does not make clear the difference between a theoretical possibility of traveling in time and building a time machine. That is, the different between theory and practice. What Ben Tippett has developed is a purely theoretical mathematical model.
  2. It presents the idea as something new which puts an end to a string of failures and disappointing calculations. Space-time loops, however, are known to be compatible with the general theory of relativity since quite a long time ago. In 1992, for instance, Stephen Hawking came to the conclusion that it would not be possible to use them without negative energy, something that is not known to exist. In 2005, the Israeli Amos Ori proposed a procedure that would not require it, consisting of spinning around an empty toroid region surrounded by a sphere containing enormous amounts of matter (e.g. a black hole). This is not so different from what is being proposed now.

Thursday, May 18, 2017

Is the increase in life expectancy accelerating?

Nick Bostrom
Some philosophers, such as Nick Bostrom and the transhumanists, have concocted an updated version of Nietzsche’s superman. Their forecasts are based on two scientific advances presented as imminent since several decades ago: immortality, which will be attained when the advances in medicine increase life expectancy beyond one year per year; and artificial intelligence, the design of super-intelligent machines. Both advances could be combined to attain immortality through artificial intelligence, by downloading our conscience (something we cannot even define scientifically) into a super-intelligent machine, so that it would go on existing inside the machine.
Unfortunately for transhumanists, the UN data do not confirm their expectations. Let us look first at the data about the evolution of the maximum life expectancy in the world from 1950 to 2015 (see table 1). These and the following data have been taken from https://esa.un.org/unpd/wpp/Download/Standard/Mortality/.

Thursday, May 11, 2017

Four ideas by Alvin Plantinga about God and materialism

Alvin Plantinga
Taking advantage of the awarding of the Templeton Prize to the American philosopher Alvin Plantinga, this post will try to review a few of his thoughts in the debate between theism and materialism. As it is impossible to review all his work in detail, I will mention just four of his ideas:
  1. The Mozart argument for the existence of God. Why are we able to appreciate beauty? According to the materialistic hypothesis, there is no explanation why evolution has led us to this, as it is difficult to see how this trait could be useful for our survival. Instead of good music, we should appreciate cacophony, which is more abundant in nature. If we assume that God exists, however, this fact is easy to explain, because God appreciates beauty (in fact, God is beauty). This argument, along with many others, is in this web address.