adult
alone
biology
breakthrough
career
caucasian
chemist
chemistry
cropped
discovery
equipment
experiment
expert
eyewear
glasses
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handsome
holding
indoors
innovation
inside
job
lab
laboratory
male
man
mature
mature adult
medical technology
occupation
one person
people
profession
professional
professionalism
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research
sample
science
scientific
scientist
skills
specialist
study
studying
test
test tube
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work
working