introduction to science. science is two things: a body of knowledge – fact: your body usually has...

Introduction to Science

Science is two things:

• A Body of Knowledge– FACT: your body usually has 206 bones, depending

on how you count them– This is commonly referred to as science, but really

it’s a product of scientific inquiry

• A Process– The scientific method is used to explore the

universe in search of facts and conclusions– Numbers are facts, conclusions are subjective

Extremely Important:

• We use facts to draw conclusions– These conclusions may be subjective!

• These conclusions, when agreed upon, may be used to collect new facts– This is the progress of science!

• When conclusions are shown to be faulty, “facts” based on them must be thrown out!– This happens all the time!

Misuse of Science

Also possible:

• The Earth is actually closer to 6 billion years old, but isotope decay speeds up over time and we don’t know about it yet

• God made the earth 6,000 years ago but made the rocks so that they appeared to be 4.5 billion years old

• We’re all in the Matrix right now

Scientific Method

• The process of building conclusions and then obtaining new data based on these conclusions is known as the scientific method

• Uses critical thinking and two kinds of reasoning– Inductive reasoning: Coming up with an

explanation that fits available data– Deductive reasoning: If-then statements

Steps of Scientific Method• Observation• Ask Question• Formulate Hypothesis• Make Prediction• Experiment (observation or intervention)• Analyze results• Formulate conclusion

– Hypotheses that withstand repeated testing are known as theories but are still open to modification!

Scientific Method Diagram

Practical Application• For those of you who

think this is all boring and stupid, consider this following scenario:

• You are a parent and your baby is crying. WHY IS YOUR BABY CRYING?

• I submit to you that you will not just ask your baby why it’s crying, but you will instead try to find out empirically

We are all Scientists

• Everyone uses their own version of the scientific method every time they are posed with a question!

• Science as a process is something everyone can intuitively understand

• The key is to ask the right question and be objective about what the answers may be!

Critical Thinking

• The buzzword “critical thinking” very broad, but very important for science

• Observe this newspaper article headline:– What are the FACTS?– What are the

IMPLICATIONS?

“Common” Sense• Critical thinking is one of

the most important skills you can develop in school– Often synonymous with

common sense, which unfortunately not terribly common

• The decisions we make every day about our food and money can easily be driven by faulty information!

Control & Experimental• It is impossible to make a comparison without

some kind of control group• Example (fictional): I made $500 yesterday. Is

that a lot?– YES if you compare it to yourself probably– YES if you compare it to the global yearly income– YES if I did it waiting tables– NO if I risked my life to do it– NO if you compare it to other people my same age or

who were in my same college graduation class– DEFINITELY NO if you compare it to Mitt Romney

Control Group

• A control group provides a basis for comparison

• A control group is vital for testing drugs, but also key to many other experiments– Also vital: large sample

size, good use of statistics

Science and Controversy• Science produces a lot of

controversy– Naturally, since science is

deeply involved in our lives!

• Science should be used to become right, not to prove you are right!– Trying to prove you’re

right means you have already emotionally accepted your own position as fact!

Controversies in Human Biology

• Embryonic stem cell research• Cloning• Abortion• Rationing medical care• Genetic engineering of humans and animals• Steroid and other drug uses

Why are these controversial?

• Because people have different values!

• Please, in this class, show respect for the values of others!– Do not expect others

to respect your own values if you do not!

Isn’t this fun?!?!

• Hearing facts is easy• Learning facts is less easy• Internalizing facts is less easy• Learning critical thinking is even less easy• Applying critical thinking to your own thinking…

that’s hard!

• We’re going to work hard this semester!(Because things worth doing are always hard)

See you next week!

• Remember, starting next Monday, group quizzes at the start of class will be on the readings and/or videos for that day’s lesson!