It's been almost 1,000 years since Arab scholar Ibn al-Haytham (Alhazen) began writing his Book of Optics, a groundbreaking treatise that led to the development of the microscope. Scientific American has a round-up of the winners of the 2009 Olympus BioScapes Digital Imaging Competition, and I think al-Haytham would be astonished and proud.
See all the pictures at ScientificAmerican.com