Ключевые слова: 30s, analysis, analyzing, blue, caucasian, chemical, chemistry, closeup, concentration, equipment, examine, examining, experiment, expertise, focused, formula, glove, health, healthcare, lab, laboratory, looking, male, man, medical, medical research, medical sample, medicine, microscope, mid adult, practitioner, profession, protection, research, researcher, researching, safety, sample, science, scientific, scientist, scrutiny, serious, specialist, structure, study, studying, technician, technology, working,