Here’s the classification of each statement from “Make Your Own Microscope”:
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“I was able to keep the money I would have spent in my bank account, where it is earning interest every day.” - Fact
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"Finally, this whole process left me with a terrific tool." - Opinion
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“The best thing about making a smartphone microscope is that it costs almost nothing.” - Opinion
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“I bought the rest of it right there at the mall, and I paid a grand total of $7.99 for everything.” - Fact