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Teacher conducts chemistry lesson with flasks, students observe experiments in lab
Teacher shows fire experiment, students observe chemical reaction in lab
Lab assistant uses microdoser for blood test analysis, scientist observes hematology
Lab assistant observes samples under microscope performing blood tests in laboratory
Lab assistant inspects blood plasma in test tube, medical scientist observes in lab
Blood plasma test in lab, assistant holding vein sample, medical scientist observing
Young boy learning wildlife photography with telephoto lens outdoors