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The Scientific Method

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Lewis Zhang

on 3 September 2013

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Transcript of The Scientific Method

The Scientific Method
Be curious
Research to see if you question has already been answered
Step 1: Ask Questions
Be detailed and specific
Take photos to review later
Step 3: Formulate a Hypothesis
A hypothesis is a proposed explanation to something
A hypothesis should provide a possible answer to your question and must be testable
Step 4: Design and Perform Experiments
Perform tests multiple times to confirm your results
Record experiment results step-by-step in a way that another person interested in performing your experiment can easily understand and follow each step in the experiment.
Search for evidence through tests
Use a control
After a sample of neodymium fell into a petri dish of E. coli, no more neodymium grew. I wondered why. I asked other people and checked the internet if anyone had results or conclusions explaining why, yet notably, this phenomenon had not been observed before.
Step 2: Make Observations
I observed the petri dish and found that growth of the E. coli has been inhibited in a radius of approximately 0.7mm around the speck of neodymium.
If magnetism was inhibiting E. coli growth, then concentrated magnetite would work equally well. I put magnetite into E. coli and it didn't inhibit growth of the bacterium.
I put neodymium in the E. coli to act as a control and it still inhibited the growth.
Examples for
Drawing Conclusions
After trying the experiment multiple times, I found that magnetite didn't impact E. coli growth but neodymium did. Therefore E. coli is not affected by magnetism.
Step 5: Analyze data and come up with an explanation
by Vivek K. and Lewiz Z.
Now analyze the data in order to come up with a conclusion
Make sure to include both qualitative data and quantitative data when possible
Step 6: Form a Conclusion
Make sure to include an overarching conclusion, evidence (which is pure, unquestionable fact gained from the experiment), and reasoning, which is what you figured out from the evidence.
Step 7: Question Your Answer
Have peers perform similar tests and see if they corroborate your results
Examine your tests to see if you made any errata
I wanted to know what cased the inhibition of E. coli. My colleague discovered that all Rare Earth Metals inhibit E. coli.
Example Question: Will the magnetic properties of neodymium inhibit E. coli growth?
Example Hypothesis: If something is inhibiting E. coli growth, then it is the neodymium's magnetic effect because the E. coli may be affected by magnetism.
After trying the experiment multiple times, I found that magnetite didn't impact E. coli growth but neodymium did. Therefore. E. coli is not affected by magnetism.
Claim: When you put neodymium in an E. coli sample, the magnetic properties of neodymium are not what causes the E. coli to die.
Evidence: Magnetite didn't inhibit E. coli growth. Neodymium did.
Reasoning: If magnetic materials inhibit E. coli growth, then magnetite would inhibit E. coli the same as neodymium did. However, it did not.
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I hypothesize that the magnetic properties of neodymium have changed the workings of some cell structure inside E. coli.
Example Conclusion:
Full transcript