For almost 25 years, chemists and other scientists have tried to build an electronic nose that can take a whiff of the air, food or other objects and say whether the odor is nasty or nice.

Intro theme and various sound effects by Adam Dylewski; music by Kevin MacLeod (incompetech.com); Creative Commons licensed audio from freesound.iua.upf.edu includes factory sounds by kokuya, dog bark by mich3d and electricity sound by Halleck