![A-laboratory-technician-prepares-a-substance-for-analysis,-crushing-a-white-substance-between-two-glass-plates](https://videocdn.cdnpk.net/euphony/content/video/partners2242/thumbnails/BB_28615d4a-7b7a-4123-8493-91a76fc433af_small.jpg)
A laboratory technician prepares a substance for analysis, crushing a white substance between two glass plates
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