- An area of knowing

AimsUnderstand what elements constitute the scientific

methodRecognize the strengths and limits of the scientific

methodKnow what makes a scientific claim and know what

pseudo science isAppreciate the meaning of truth in a scientific

contextDiscuss the interplay between science and other

AOK

Group work (resource booklet: natural science)

Team 1: What is the scientific method (pp.3, 4,5) and its strengths

Team 2: What is a paradigm, a paradigm shift (with examples) – pp 6,7, 11

Team 3: What are the possible limitations of science (Humes problem of induction) pp 8

Team 4: what is ‘falsification’ – Karl Popper pp. 9-10

Team 5: science and pseudo-science pp. 222-225 Lagemaat

Experimental data or

observation

Inductive hypothesis

Prediction and experimental

test

Theory is confirmed and

tentatively accepted

Theory is falsified and

rejected

The Scientific Model

HUME’S PROBLEM OF INDUCTION

The fact that all observed metals expand when

heated doesn’t mean that all metals expand

when heated logical fallacy of induction (from

particular to general)

FALSIFICATIONPopper tried to resolve the problem of induction in the

scientific method suggesting that scientists should spend their time trying to prove that their hypotheses are false

In this way scientists could be sure of their resultsHe suggested to test in such way well proven hypothesesAny theory that resists our best efforts to falsify it should

be provisionally accepted as the best we have for the time being

Popper’s theory is fascinating but not very useful

Criticism of PopperFalsification is conclusive in theory but not in

practice (we consider experiments that prove the theory wrong as mistakes in observation)

Auxiliary hypotheses can rescue a falsified theory (when our theory is proven wrong with consider some additional hypothesis that may explain it – Neptune!)

The concept of proof is only relevant to logic and mathematics, not science

Science as a HUMAN Endeavour

Thomas Khun

Kuhn was a historian of science, who noticed that, as a matter of historical fact, scientists did not work by falsification. He said that scientists hold some fundamental beliefs (ie paradigms) so strongly that they are sometimes not prepared to allow them to be falsified; they may ignore or disbelieve findings which seem to disprove them.

Example

The paradigm of the earth being the centre of the Universe was technically falsified by Galileo and Kepler but was not accepted for hundreds of years.

Why?

Can you think of another?

Consider……..

We assume life does not exist on other planets because we believe all life must be based on the element carbon and needs oxygen, light etc to survive.

Life has been noted in what appears to be very hostile conditions: volcanoes, frozen tundra, submarine volcanic vents etc.

So….. Is there life on Mars, Jupiter etc?

If you did an experiment which seemed to have falsified the conservation of energy theory what would you do?

Do you think Khun’s model is an accurate description of science?

Science - a Universal tool?

What distinguishes natural Sciences from other sciences eg Social Science?

The amazing thing about nature is that, as far as we know, the underlying laws that govern it are unchangeableunchangeable.

'People fall in love because of their psychological make-up. Psychology reduces to biology; biology to anatomy; anatomy to chemistry; chemistry to physics. So to be the best psychologist you can be, you should study physics.' On what grounds would you accept or reject this statement?

Imagine that at some future date we eventually find all the laws of nature -'the rules of the game'. What would that mean for our ability to make things and control the world?

Reductionism

Some sciences are increasingly taking a holistic approach whereby they try to avoid reduction. Does this mean that they are still sciences, or have they become something else?

Think back over your science education. What did you learn about the way science works?

Are the theories discussed in this topic realistic about the way sciences work?

Are they the way sciences should work?What do you imagine professional scientists

think makes the natural sciences so special.

Science and Creativity

Scientists make new hypotheses?

1. Attempt-to form hypotheses for the following:Stars twinkle. Birds sing.Air is odourless. Cuckoos find their way from Singapore to China

by themselves. Berries taste good. When you release a hydrogen-filled balloon it

rises.

Are your hypotheses testable? If so, how?

2 Suppose your new hypothesis has been tested and it failed. We reject it. Come up with another testable hypothesis.

3 It has been said that the most creative minds belonged to Scientists. Einstein’s general theory of relativity is no less a masterpiece than Mozart’s “requiem” or a painting by Picasso. Do you agree? Discuss and come up with some “fors” and “againsts”

•We have considered at least four aspects of sciences: inductivism, falsification, paradigms and creativity. •Think of some examples of each aspect. •What are the respective roles of each component? •Are any components more important than others? •What are the problems with each aspect?

SUMMARY TASK:

TASK: science and….Label your poster

Team 1: inductivism (Hume’s problem) Booklet pp 8Team 2: falsification (K. Popper) Booklet pp 9-10Team 3: paradigm (T. Khun) Booklet pp 7 and 11Team 4: creativity. Booklet pp 3-5

TASK Write, in your own words, a short summary

(3 paragraphs) of

Hume’s criticism of induction in sciencePopper’s falsification theoryKuhn’s concept of paradigm within the

philosophy of science

End 1 pm

Science and pseudo sciencePhysicsAcupunctureAstrologyCreationismCrystologyChemistryGraphologyHomeopathyphrenology

biology

Science and pseudo scienceScience:

Scientific hypotheses (claims) are testableScientific hypotheses (claims) are clearly

stated and make precise predictionsScientific hypotheses (claims) They are always

valid (no ad hoc exception)

Pseudo scienceClaims are vague, allow for ad hoc exceptions,

(scientific) claimsWhich of the following statements make scientifically

testable claims?In 2010 you may or may not win the lotteryIt always rains on TuesdayWe have all lived past lives, but most of us are too

enlightened to remember themReal men don’t cryUnlike magnetic poles attract each otherEveryone is selfishAcid turn litimus paper redSomething surprising will happen to you next week

Problems of the scientific method

Observation 1 Relevance2 Expectations3 Expert seeing4 The observer effect

Testing hypotheses 5 Confirmation bias6 Background assumptions7 Many different hypotheses are consistent with a given set of data the principle of simplicity, beauty and elegance

Law 8 Problem of induction

Science and truthThere is no absolute proof in science and we cannot

neither conclusively verify nor falsify an hypothesis but

If a scientific theory accounts for the known evidence, is internally consistent, and works in practice then we should – for the time being – accept it as true.

We should maintain a critical attitude to our scientific beliefs and be wiling to question our assumptions

2002 Essay Title

"The arts deal in the particular, the individual and the personal while the sciences deal in the general, the universal and the collective." To what extent does this statement obscure the nature of both “Areas of Knowledge”?

Scientific Claims? The Earth is flat.

The Earth is not exactly round, but it is actually a bit wider at the equator.

UFOs regularly visit Earth to abduct humans for experimentation.

God created the world in seven days approximately 5000 years ago.

God created the Universe.

God did not create the Universe.

In some remote areas of China, there are people who can jump higher

than 10 m.

Scientific Claims?

In some remote areas of China, there are people who can jump

higher than 10 m, but their society is so secretive that they will never

permit outside observers to witness it.

Love is more important to human beings than anything else.

If you ask people what they find most important in a multiple choice

question, and you include love as a possible answer, then more than

75 per cent will put love at the top of their list.

Saying 'I love you' to your partner.

Picasso's painting 'Cannes, 4a.m.' is a beautiful piece of art.

How complete is Science?

If Science never proves anything right, why do we trust it so much?

Think about the Science you learn at school. How likely do you think it is wrong or incomplete?

Consider……..

What are the limitations of scientific enquiry? (In other words, is

there anything which science cannot tell us about the world?)

Can religion or myth be used to explain things which science

cannot?

Should scientists be held morally responsible for their discoveries? Is

any area of scientific knowledge morally unacceptable?

What do you think is meant by the words, "It is through science we

prove, but through intuition that we discover"?