*1st Place: Sensing Danger*
Olena Kamenyeva, National Institute of Health, Bethesda, Maryland.
Subject: Recruitment of neutrophils to the site of laser damage in mouse inguinal lymph node.
*2nd Place: Sperm From Two Males Competing*
Stefan Lüpold, Syracuse University, Syracuse, New York.
Subject: Sperm from two males competing within reproductive tract of a female fruit fly (Drosophila melanogaster). Magnification: 400x.
*3rd Place: Growing Complexity in the Kidney*
Nils Lindstrom, University of Edinburgh, United Kingdom.
Subject: Complexity of ureteric bud branching and nephron formation.
*Honorable Mention: The Rotifer Limnias melicerta*
Fengzhu Xiong, Micropolitan Museum Rotterdam, The Netherlands.
Subject: Limnias melicerta (a rotifer). Magnification: 400x.
(via Best Microscope Videos of 2012 | Wired.com)