There are things that are too small to see, but we can smell some of them.
There are very small things, too small for our eyes to see.
Our sense of smell can sometimes detect tiny particles that are too small to see.
Developed for the NISE Network with funding from the National Science Foundation under Award Numbers 0532536 and 0940143. Any opinions, findings, and conclusions or recommendations expressed in this product are those of the authors and do not necessarily reflect the views of the Foundation.