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

waiting-room-1

airport-sign

sign-1

flight

arrival

waiting-room-2

passenger-1

airplane-3

window

document-1

luggage-2

waiting-room-3

seat-belt-1