An epidemiologist researched bacteria-- virus too, I think. They study outbreaks of illnesses, try to figure out what started them, and come up with solutions to those outbreaks.
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Isolation—this passage illustrates how sad Walton feels about having no one to share his success or failure with.
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A topic sentence for what? like, "It's important to know how to defend yourself in dangerous situations" kind of topic sentence or "a knife to the throat is the best way to kill someone" kind of topic sentence. I just need some more details.
To leave out personal opinions
