Oscillatoria - Gerd A. Guenther
Filamentous bluegreen algae of the genus Oscillatoria, time lapse movement of filaments. Taken with light microscope, magnification about 1000x.

Oscillatoria - Mon Microscopic

Heterocyst formation in the filamentous cyanobacterium, Anabaena sp. PCC 7120
Hideo Iwasaki (metaPhorest)

Waterflea (Daphnia) playing with Volvox -  Dr. Ralf Wagner
3rd place in Nikon Small World Competition 2011 

Meteorite chondrules in cross polarized light
Video: Runar Sandnes