professor

electro-cardiogram-1

science-calculator

drug-1

flask-3

test-dna

friability-tester

note

mortar-1

goggles

mouse-2

telescope

mask

lab

newton-cradle-1

scale-2

electro-cardiogram-2

bunsen-burner

bunsen-burner-1

book

book-note

book-1

blood-test

benzene

benzene-1

beaker

beaker-1

battery

barometer

bacteria