History of Science History of Philosophy l Faghrie

History of Science History of Philosophy l Faghrie Mitchell

What is History? What is Science? What is Philosophy?

What is History?

What is Science?

What is Philosophy?

History? Science? Philosophy? Curiosity? q Almost in the beginning was curiosity. Asimov’s New Guide to Science (Asimov 1987)

Early Man: Curiosity Science www. fi. edu CURIOSITY H I S EXPLORATION T O DISCOVERY R Y SCIENCE

Ancient Egypt: Curiosity Science Osprey

Ancient Egypt: Evolution of the Pyramids www. touregypt. net Djoser 2630 -2611 BC Step Pyramid Saqqara, Egypt Snefru 2575 -2551 BC Cheops/Khufu 2551 -2528 BC

Ancient Egypt: Evolution of the Pyramids Djoser 2630 -2611 BC www. touregypt. net Snefru 2575 -2551 BC Intermediate Pyramid Maidum, Egypt Snefru 2575 -2551 BC Cheops/Khufu 2551 -2528 BC

Ancient Egypt: Evolution of the Pyramids www. touregypt. net Cheops/Khufu 2551 -2528 BC Djoser 2630 -2611 BC Smooth Pyramids Giza, Egypt Snefru 2575 -2551 BC Cheops/Khufu 2551 -2528 BC

Why show the Evolution of the Pyramids? q Did the ancient Egyptians have science q To build a pyramid you need to have knowledge and skills about stone and rock q E. g. how much stone, how many men to cut and move the stone, etc (quantity surveying) q E. g. how do I find good quality stone, how do I move the stone (geology and engineering (mathematics)) q Evolution of pyramids is an example of the evolution of ancient Egyptian science Djoser Step 2630 -2611 BC Snefru Intermediate 2575 -2551 BC Cheops/Khufu Smooth 2551 -2528 BC Ref: Shaw (2003)

Why show the Evolution of the Pyramids? q Did the ancient Egyptians have evolving science q Ancient Egyptians had to improve their building techniques going from Step to Intermediate to Smooth pyramid (increasing difficulty and challenge of building a smooth pyramid) q The Intermediate pyramid at Maidum could be seen as a prototype pyramid q The Maidum pyramid is speculated to have been either abandoned, or to have collapsed because of the slope of the pyramid q The lessons learnt from this pyramid and previous pyramids were: (1) to build on rock instead of sand (2) to tilt the stone blocks inward to stabilise the pyramid (see next slide) Djoser Step 2630 -2611 BC Snefru Intermediate 2575 -2551 BC Cheops/Khufu Smooth 2551 -2528 BC Images: www. touregypt. net

Why show the Evolution of the Pyramids? www. unmuseum. org Snefru Intermediate 2575 -2551 BC Cheops/Khufu Smooth 2551 -2528 BC

Why show the Evolution of the Pyramids? q Did the ancient Egyptians have science q Did the ancient Egyptians have evolving science q Did the ancient Egyptians have philosophy of science ? ? ? q So you do not need to have PHILOSOPHY OF SCIENCE to have SCIENCE? YES and NO Ref:

Why show the Evolution of the Pyramids? q So you do not need to have PHILOSOPHY OF SCIENCE to have SCIENCE? YES and NO MYTHOLOGY RELIGION DOGMA can SCIENCE PHILOSOPHY can SCIENCE Ref:

Why show the Evolution of the Pyramids? q Conversely, you also have three similar paths, leading to NONSCIENCE, instead of SCIENCE MYTHOLOGY RELIGION DOGMA can NONSCIENCE PHILOSOPHY can NONSCIENCE Ref:

Ancient Egyptian Medicine q The Evolution of pyramids serve to show that the ancient Egyptians had SCIENCE. I will now show a clearer example, to show ancient Egyptian SCIENCE and NONSCIENCE MYTHOLOGY RELIGION DOGMA n ca ca n NONSCIENCE Example: Ancient Egyptian Medicine Ref:

Ancient Egyptian Medicine www. nyu. edu q Example: Ancient Egyptian Medicine q Some of the oldest scientific artefacts q Edwin Smith papyrus (c 1600 BC), 22 pages which deals mainly with the treatment of wounds Wikipedia q Ebers papyrus (c 1550 BC), 110 pages which contains 700 magical formulas and remedies Ref: Wikipedia, www. nyu. edu, Crystalinks

Ancient Egyptian Medicine q Out of the Edwin Smith and the Ebers Papyruses, one can draw examples of SCIENCE and NONSCIENCE (of which I will list only a few) SCIENCE q Use of ox liver, to treat night blindness (www. es. flinders. edu. au) q Use of honey as antibiotic on open wounds (www. nature. com) NONSCIENCE q Half an onion and the froth of beer as a remedy against death q Use of lettuce or castor oil for alopecia Ref: Wikipedia

Impression of Ancient Egyptians q So, they got some right, some wrong. Pretty impressive though to have a structure (Giza pyramid) still standing after more than 4, 000 years (c 2500 BC-2000 AD) q Coming back to the earlier point: There is no evidence available to say that the ancient Egyptians had a philosophy of science. q So how could they establish themselves one of the great ancient civilisations? q A civilisation, like the ancient Egytians, endures and maintains itself because it: (1) solves practical problems (feeding and defending its people) and (2) puts in place a form of government able to preserve it. q So, science and governance, not philosophy, are needed to have a developed culture or civilisation. Ref: Robinson

Impression of Ancient Egyptians q A more important point relates to: “So, they got some right, some wrong. ” q How do we maximise right and minimize wrong? q Or rather, How do we maximise SCIENCE and minimise NONSCIENCE? Ref: epnet

Summary of section on ancient Egyptians q The two points made in the preceding slides, effectively summarise this section q I have covered the first path so far (striked out). I will combine the second and third paths, and discuss them as if they are one MYTHOLOGY RELIGION DOGMA can SCIENCE PHILOSOPHY can SCIENCE Ref:

What is Philosophy? q How do we maximise right and minimize wrong? q Or rather, How do we maximise SCIENCE and minimise NONSCIENCE? q Just by asking these questions we are asking philosophical questions. We are also answering what philosophy is. q “So what is philosophy anyway? Philosophy is not there to solve practical problems, problems of society or individual. Rather philosophy tests our most fundamental beliefs, values and convictions that we have, and to test them for the purpose of getting them right. This testing is in the form of asking critical questions, of debating, which is the central aspect of the philosophy. Philosophy is the love of wisdom. The love of getting to the right answer using debate. ” (Daniel Robinson, Georgetown University). Ref. Robinson:

What is Philosophy of Science? q Understanding philosophy can be simplified by asking two simple questions, namely: 1. What is good, what is bad? 2. What is right, what is wrong? q The first question relates to human behaviour, specifically, for example, ideas on virtue, morals and ethics. BROAD STATEMENT: Scientists are less interested in this. q The second question relates specifically to ideas on logic and reason, and perception and reality. BROAD STATEMENT: Scientists are more interested in this. q So even though we can say that “…Philosophy is not there to solve practical problems, …”, it does not mean that we cannot use philosophical thought to help us solve scientific or practical problems. Ref. Robinson:

The Age of Mythology Wikipedia: Thalus of Miletus q Prior to the establishment of the first Greek school of thought by Thales of Miletus (c. 624 -546 BC), the Greeks looked only towards Olympia (heaven) and the gods for explanations relating to their world q Thales theorem: An inscribed angle in an semicircle is a right angle Wolfram q Also predicted an eclipse would happen in 585 BC which actually occurred

The Age of Mythology Wikipedia q The role of the gods in the thinking of the ancient Greeks is illustrated in the epic by Homer (c. 7 th century BC), called the Iliad q The Iliad is a story which is believed to combine myth (fiction) and ancient Greek history, and is supposed to have happened in the 12 th century (The films Helen of Troy and Troy is based on this story) q The Iliad starts off with the Greek gods Zeus and Poseidon who both desire the sea-nymph, Thetis q They become afraid of pursuing Thetis when it is prophesized that any future son of Thetis wil be greater than his father; so they back off

The Age of Mythology q At the wedding, you have gods, goddesses, demi-gods and mortals in attendance Amazon. com q They allow Thetis to marry the mortal king, Peleus q A dispute arise as to who is the most beautiful goddess. The gods decide that the young Trojan prince, Paris, must decide q He opts for the goddess, Aphrodite, because she promises him the most beautiful woman in the world, which is Helen Ref. Robinson:

The Age of Mythology Amazon. com q Some time later, Paris meets Helen, but unfortunately finds her to be married to Melenaus, a Spartan prince q Helen had many suitors before marriage, each of which who made a pledge to her father to protect Helen and her future husband q So with Helen’s abduction, they set off to Troy Ref. Robinson:

The Rise of Philosophy q It also illustrate that the gods interfere with mortals’ lives, but they remainly interested in their own needs Wikipedia: 12 Gods of Olympus q The Iliad clearly illustrates the fickle, emotional, and unpredictable nature of the gods q The ancient Greeks felt; there was a distance between Olympia (Heaven) and Athenia (Earth) q However, this does not necessarily mean that they started to discard their religion, Olympianism It means that they had to deal with this dualism, each in their own way for example Plato stated: The Earth is imperfect and changeable, the heavens were perfect and immutable

The Rise of Philosophy Wikipedia: Plato q The Greek philosophers, Plato (427347 BC) and Aristotle (384 -322 BC), were the first Greek philosophers to adequately deal with questions about their world, their beliefs and their reality – to confront dualism Wikipedia: Aristotle

The Rise of Philosophy Wikipedia: Raphael’s School of Athens; www. hull. ac. uk

The Rise of Philosophy q Aristotle (on the right): he is interested in particulars, specifics Wikipedia: Raphael; www. hull. ac. uk q Plato (on the left) pointing upwards: he is interested in the forms, universals, generals Ref. Robinson:

The Rise of Philosophy: PLATO Wikipedia q Knowledge is that which is true and that which is believed q 1. Something can be true, but is not believed e. g. some truth about our universe which has not been discovered yet 2. Something can be believed, but is not true e. g. urban legends, myths, conspiracy theories Plato has a top-down perspective on knowledge, he favours deductive reasoning Ref: f. Wikipedia

The Rise of Philosophy: ARISTOTLE q Aristotle more interested in specifics, so he writes the Physics, and then the Metaphysics and later on Historia Animalium www. natuurinformatie. nl q Aristotle (384 -322 BC) differed from Plato in that he had favoured a bottom-up approach, and preferred empiricism over deduction q The Historia Animalium was written rather hastily, but contains lenghthy descriptions of countless species of fish, shellfish, and other, animals and their anatomies. Ref. Robinson:

The Rise of Philosophy q The Physics is collection of lessons on theoretical, methodological, philosophical concerns, rather than physical theories or contents of particular investigations. q It sets the bases for scientists to study the world subject to change, and change, or movement, or motion (kinesis) is one of the chief topics of the work. q The Metaphysics is so named because it came after the Physics. It is divided into three parts (1) ontology, (2) theology and (3) universal science. q Ontology is the study of existence; it has been traditionally defined as 'the science of being'. Theology refers to the study of God (or the gods). Universal science is supposed to be the study of socalled first principles, which underlie all other inquiries. Ref. Robinson:

Plato and Aristotle: Two Perspectives Plato Aristotle “Top down” approach Bottom up approach One starts with an idea Drawing conclusions from observation Theory laden observation Empirical tradition Rational tradition DEDUCTIVE REASONING INDUCTIVE REASONING Ref. Robinson:

Conclusion on Ancient Greek Philosophy q With Plato and Aristotle, the foundations for deductive and inductive reasoning was put in place, methods of thinking which could maximise science and minimise nonscience q However, this was just a start on an otherwise long road MYTHOLOGY RELIGION DOGMA can PHILOSOPHY can SCIENCE NONSCIENCE Ref:

The Rise of the Roman Empire wps. ablongman. com q The Roman Empire started to emerge in 282 BC, after the Etruscans were defeated at the Battle of Populonia, and the defeat of the Greek colony at Tarentum q Rome established colonies in strategic areas, which led to the demise of the Macedonian and Seleucid Empires (c 2 nd century BC) q Rome was the superpower, they controlled the Mediterranean Sea Ref:

The Rise of the Roman Empire Greek culture survived, because Rome took it as its own q However, in general, the Romans did not have the same penchant for the dialectic tradition (debate) and philosophy lost its appeal q Rome was more interested in conquest wps. ablongman. com q Ref:

The Rise of the Roman Empire wps. ablongman. com c. 49 -45 BC Expansion under Julius Caesar 14 -117 CE Height of Roman Power 284 -305 CE The Empire under pressure Pull back from Britain, Dacia and Mesopotamia

The Decline of the Roman Empire wps. ablongman. com c. 400 -526 CE Barbarian migrations and invasions 527 -565 CE Byzantium Empire under Justinian c. 632 -750 CE Rise of Islam

Preservation of Scholarship q Islam starts to occupy parts of the Byzantine Empire q Start to see emergence of Islamic and Jewish scholars and philosophers who translates Greek texts into Latin q E. g. Al-Farabi comments on Plato’s Republic wps. ablongman. com q War between the two blocs, but also dialogue (debate) wps. ablongman. com q 9 th and 10 th centuries

Preservation of Scholarship q 9 th and 10 th centuries www. multimediaquran. com q Islam encourages scholarship e. g. the first revelation received by the unlettered Prophet (SAW), instructed him to read, the Prophet (SAW) also said that knowledge must be sought even if in China Wikipedia q Al-Farabi comments that justice and rational thought will not come when kings are philosophers and philosophers are kings, but rather it will come when the philosopher is a prophet and a prophet is a philosopher Read: In the name of thy Lord Who createth

The Fall of the Byzantine Empire Osprey q 1453 Siege mentality q Steady outflow of Byzantine-Greek scholars heading west q Increases scholarship in the West q Scholarship stopped in 476 AD because 1. disintegration of political structures q 2. attack and invasions 3. loss control of the Mediterranean and trade routes 4. emergence of the Church

The Scientific Revolution Wikipedia q 12 th and 13 th centuries q The Renaissance q 1543 Scientific Revolution q Publication of Archimedes (287 -212 BC) Wikipedia: Vesalius q Vesalius (1514 -1564) Published work on dissections replaces Galen (129 -200 AD) Wikipedia: Copernicus q Copernicus (1473 -1543) A heliocentric system

The Scientific Revolution Descartes Bacon q 1543 Emergence of Philosophy q Father of Philosophy Rene Descartes (1596 -1626) I think, therefore I am q Johannes Kepler (1571 -1630) Galileo q Galileo Galilei (1564 -1642) Kepler q Emergence of Sir Francis Bacon (1561 -1626)

The Scientific Revolution Plato Aristotle “Top down” approach Bottom up approach One starts with an idea Drawing conclusions from observation Theory laden observation Empirical tradition Rational tradition DEDUCTIVE REASONING Rene Descartes INDUCTIVE REASONING Sir Francis Bacon

Sir Francis Bacon: Induction Wikipedia Observation(s) 1 2 3 Bacon q What is induction? Inductive reasoning starts with an observation. Repeated observation leads one to conclude that: All observed swans are white (specific statement) Therefore all swans are white (general statement)

Problems with Induction q What would happen if we went to Australia and see a black swan? CONCLUSION: We were wrong, our reasoning is not sound Wikipedia: The Black Swan (Cygnus atratus) q What would happen if we stayed in Europe and only saw, white swans during our lifetime? CONCLUSION: All swans are white Wikipedia: Mute Swan (Cygnus olor) q There are weaknesses to the inductive method of reasoning, for example looking at our argument: All observed swans are white (specific statement) Therefore all swans are white (general statement)

Problems with Induction q Below another example: Turkey has seen may days come and go, why should 25 December be any different? Induction proves fatal 01 January-24 December 25 December www. kidzone. ws

Problems with Induction: David Hume Wikipedia q The example of the swans and the turkey are both hasty generalisations, which assumes all swans are white, and as a healthy turkey I can expect to see the next day q David Hume (1711 -1776), Scottish philosopher, pointed out this weakness of induction q Hume was however, in agreement with Bacon that knowledge must be gained empirically, through observation, experience and experimentation q Despite Hume’s objection, and the problems with induction, we see three centuries of massive gathering of scientific knowledge using induction

Empiricism vs Dogma (Induction vs Deduction) q Sir Francis Bacon emphasised that knowledge could only be gained by experiencing the world i. e. make observations, collect data, conduct experiments (empiricism) q The inductive method of inquiry was in opposition to the dogmatic teachings of the Church, which made biased, subjective assumptions q The Church is dogmatic because it assumes that religious knowledge is true and can be used to derive scientific knowledge or truths; the Church uses deductive reasoning q An example of this clash can be seen with the response of the Church to Galileo, after he supported Copernicus’ idea on a heliocentric system (the Earth is the centre and the other heavenly bodies revolve around it)

Empiricism vs Rationalism (Induction vs Deduction) q Bacon and Hume was also in opposition to the Continental Rationalists, for example Rene Descartes (1596 -1626) q Descartes was a mathematician and he followed the same method used by the ancient Greek mathematicians, namely, start with a set of ideas (theorems, axioms) and derive a new theorem from that body of existing knowledge q The continental rationalist, like Descartes, Leibniz and Spinoza, drew a distinction between knowledge of eternal truth, for example, mathematics, and knowledge which had to be gained through experience (experimentation), for example, biology

Empiricism vs Rationalism (Induction vs Deduction) q New mathematical knowledge can be gained by using existing knowledge, using logic and reason to produce new mathematical knowledge, because mathematical truth is absolute, eternal, and certain Wikipedia 1 1

Hypothetico-deductive Method q However, that is not to say that biologists do not use the deductive method of reasoning q Deduction and induction often work together in the natural and physical science Wikipedia: Popper q The natural and the physical sciences lends itself better to empiricism, and less so to rationalism (using logic and reason alone)

Hypothetico-deductive Method q Induction ensures that there is an adequate number of unbiased observations (accumulated knowledge) q Deduction can use the accumulated knowledge to ask question based on reason and logic q An example of this is the Global Warming and Global Dimming issue

Hypothetico-deductive Method q An example of this is the Global Warming and Global Dimming issue INDUCTION DEDUCTION experience reason falsification experiment logic observe RATIONALIST EMPIRICIST Induction increases the body of knowledge BODY OF KNOWLEDGE FACT Deduction draws from the body of knowledge THEORY

Hypothetico-deductive Method INDUCTION accumulation of weather data supporting Global Warming EMPIRICIST Induction increases the body of knowledge falsification BODY OF KNOWLEDGE FACT DEDUCTION reason about weather data and its effects RATIONALIST Deduction draws from the body of knowledge THEORY

Hypothetico-deductive Method INDUCTION accumulation of weather data supporting Global Dimming EMPIRICIST Induction increases the body of knowledge falsification BODY OF KNOWLEDGE FACT DEDUCTION reason about weather data and its effects RATIONALIST Deduction draws from the body of knowledge THEORY

Hypothetico-deductive method q The hypothetico method uses falsification instead of verification to test theories q Sir Karl Popper developed the hypothetico-deductive method to counter the biased verification of theories q This method also tested existing theories and ideas, using deduction

Thomas Kuhn q Core science is proven scientific knowledge, which scientists do not question, they do not try to falsify it q Normal science is the science that scientist do everyday to find answers, namely, the accumulation of data and to solve questions or puzzles Wikipedia q Thomas Kuhn (1922 -1996) stated that there are two types of knowledge or science, namely, core science and normal science

Thomas Kuhn q Normal science sometimes comes up with anomolies, which does not threaten the core science, for example global dimming was explained to be a symptom of climate change q However, as anomolies accumulate over time, scientists have to revisit what they previously held to be true. They can no longer ignore the anomolies, and must instead replace or modify existing core science

Normal Science Crisis Revolution Prescience