The details from this excerpt that best show that the author's purpose in including this paragraph is to illustrate how hazardous the scientists' work is:
When something is hazardous, it simply means that it is dangerous to health.
From the detail highlighted above, it can be seen that the scientists had to take a lot of protective precautions to prevent being hurt by the sharp substances. So the sentence above shows the hazard.
Learn more about hazard here:
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