1. Scientific Method

2. Science
To investigate and understand the natural world, to explain events in the natural world, and to use those explanations to make useful predictions.

3. Scientific Method Hypothesis: an educated explanation to a problem
Controlled experiment: an experiment in which only one variable is changed at a time
Control: factors kept the same
Variable: factors that change
Independent variable: factor being physically changed
Dependent variable: factor that changes in response to the independent variable; factor being tested
Conclusion: was the hypothesis correct

4. Notable Experiments
Redi
Pasteur

5. Redi
Spontaneous generation: the idea that life can arise from nonliving matter
Hypothesis  flies cause maggots
Designed an experiment
Had jars with meat, some covered with gauze, others left open
Controlled variables: jars, type of meat, location, temperature, time.
Independent (manipulated) variable: gauze or no gauze
Dependent (responding) variable: whether maggots appear
Conclusion: jars with no gauze (no contact with flies) had no maggots, jars with gauze had maggots, therefore spontaneous generation doesn’t exist

6. Pasteur Used the curved neck flask
Conclusion: air can be allowed in, but no microorganisms to inhibit the growth of other microorganisms.