The University of Utah has an amazing page showing the scale of microscopic objects in relation to those items we can see with the unaided eye. As you zoom in, then there are things which remain “invisible” since the last time I checked, scientists can only “see” atoms of the larger, unstable elements. Course I was in college then. Maybe pictures of carbon atoms have been taken.
With all the jibber jabber about H1N1, it’s interesting to see how miniscule influenza is, 130 nanometers across.
Thanks again to Dr. Plait of badastronomy.com for bringing this to my attention.