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Crystalline formation from central nervous system excitory neurotransmitter acetylcholine

Hydroquinone and sodium thiosulfate crystals

Inclusions of pyrolusite and limonite in a polished slab of Brazilian agate

Prize - John I. Koivula Gemological Institute of America - Santa Monica, California, USA Specimen: Inclusions of pyrolusite and limonite in a polished slab of Brazilian agate Technique: Brightfield

Crystallized aspirin | 1988 Photomicrography Competition | Nikon Small World (Crystallized aspirin)

Crystallized aspirin | 1988 Photomicrography Competition | Nikon Small World (Crystallized aspirin)

Ascorbic acid | 1988 Photomicrography Competition | Nikon Small World (ascorbic acid)

Ascorbic acid | 1988 Photomicrography Competition | Nikon Small World (ascorbic acid)

Magnificent Microphotography: 50 Tiny Wonders | Microscopic Images | LiveScience (rod cells)

the cells that enable you to see in the dark. They're called rod cells, and humans have some 120 million of them lining the back of the eye, shooting signals to the brain when they're stimulated by light.

Magnificent Microphotography: 50 Tiny Wonders | Microscopic Images | LiveScience

This compilation photo shows a zebrafish embryo (in purple) superimposed on a background representing a branching family tree of genes. Credit: Vanja Solin and Andreas Hartl