analysis
analyzing
biochemistry
biotechnology
bottle
bottled
chemical
chemist
chemistry
clean
contaminated
contamination
control
discovery
drink
examining
exhausted
experiment
fatigue
filtered
fresh
frustrated
lab
laboratory
liquid
man
medical
medicine
microbes
microbiology
microscope
pollutant
pollution
quality
research
researcher
sad
sample
scientific
scientist
student
studying
substance
test
testing
tired
toxic
unhappy
virus
water