Nikon Small World:

The Nikon International Small World Competition first began in 1975 as a means to recognize and applaud the efforts of those involved with photography through the light microscope. Since then, Small World has become a leading showcase for photomicrographers from the widest array of scientific disciplines.

Incredible photography. I had a blast playing, “Guess What It Is?” with my son this morning. Thanks to Dave Mark for the link.