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What is SCIENCE?
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BIOLOGY!All living things: plants, animals, bacteria, brain eating amoeba,
YOU!
PHYSICS!
The science of how and why
things move the way they do
EARTH & SPACE!
Our earth, our solar system, our universe
and beyond!
CHEMISTRY!Studying all things
that “matter”: teeny tiny atoms,
and how they interact
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How does Science work?
Is that it? Lot and lots of math?2/18/1996
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The Scientific Method
• What is the scientific method?• What does the scientific method assume?• Does the scientific method work?• What is not a scientific argument?• Does astrology follow the scientific method?
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The Scientific Method1. Observe an event.2. Develop a model (or hypothesis) which makes a
prediction.3. Test the prediction.4. Observe the result.5. Revise the hypothesis.6. Repeat as needed.7. A successful hypothesis becomes a Scientific
Theory.
model
test
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How do we test a prediction?
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Independent - the factor that you manipulate or change
Dependent - the factor that changes as a result of the independent
Control - all other variables should remain consistent
Design an experiment using VARIABLES
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How do we make Observations? • Two different types:
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QUALITATIVE Observations that don’t involve any numbers
ie) her hair is blackie) he smells bad
QUANTITATIVEObservations that involve numbers
ie) her hair is 20cm longie) he smells like 50 monkeys
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What makes a hypothesis successful?
If it continues to make accurate predictions.
If a hypothesis frequently makes accurate predictions it becomes a scientific theory.
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Medical ScienceScientific Method High Cholesterol
Observation Patient has high cholesterolHypothesis (prediction)
Certain chemicals may dissolve cholesterol deposits.
Test Give 100 patients these chemicals, give 100 patients placebo.
Observe result Same number lower their cholesterol as placebo patients.
Revise hypothesis? Try different combo of chemicals.New test? Re-run medical test. Observe
results.Scientific Theory Lipitor reduces cholesterol.
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Everyday Science
Scientific Method Car Repair
Observation Engine won’t turn over.
Hypothesis (prediction) Predict battery is dead.
Test Replace battery.
Observe result Engine now turns over.
Revise hypothesis? Not needed.
New test? Not needed.
Scientific Theory Cars won’t work without a fully charged battery.
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Everyday Science
Scientific Method Making Spaghetti Sauce
Observation Spaghetti sauce should be red.
Hypothesis (prediction) Try a tomato sauce.
Test Heat pot of tomato sauce.
Observe result Taste the sauce - bland.
Revise hypothesis? Use tomato sauce and garlic!
New test? Add garlic, taste - not so bland.
Scientific Theory The Final Recipe.
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Repeatability
A successful theory is repeatable.–By you.–By anyone.
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Example: Cold Fusion (1989)
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And then …
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Requirements
• Objective reality– We all see the same world.
• Constant Laws of Nature– What happens here, happens there.– What happened yesterday will happen tomorrow.
• The Universe is knowable.
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Does it work?
• Scientific Method is a tool.• Does this tool work?
The scientific method has helped increase life expectancy, decrease mortality rates and build new technologies. A lot of our modern conveniences owe their discovery to the scientific method.
• Are there better tools?
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Theories
• So: a theory is a highly successful hypothesis.• All hypotheses make predictions.• All theories make predictions.• All theories can be tested.• Result: Any scientific theory is subject to
change as our ability to make tests, or make observations of a test’s results, improves with time.
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Falsification
• A real Scientific Theory tells you what observations are necessary to falsify it.
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Is Astrology a Science?
Think about it with a partner...
Then, complete the worksheet
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