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mad scientist conducts chemistry experiment
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dreamstime
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beard
blackboard
bow
cheerful
chemistry
classic
coat
concentrating
crosseyed
demonstrating
discovering
discovery
eccentric
elderly
enthusiastic
equipment
experiment
expert
frizzy
funny
glasses
glassware
goggles
green
hair
hazard
horizontal
humor
ideas
inspiration
instructing
lab
mad
man
mature
messy
occupation
person
pouring
professional
professor
research
round
safety
science
scientist
senior
stereotype
table
teaching
tie
vintage
white