Puffball fungus spore, coloured scanning electron micrograph (SEM). This is the reproductive cell of the fungus. Magnification: x3000 when printed at 10 centimetres wide.

Puffball fungus spores, coloured scanning electron micrograph (SEM). These are the reproductive cells of the fungus. Magnification: x3000 when printed at 10 centimetres wide.

Deformed sperm cell. Coloured scanning electron micrograph (SEM) of a sperm cell with multiple tails. Magnification: x5000 when printed at 10 centimetres wide.

Surgical needle, SEM

Lymphocyte white blood cell, coloured scanning electron micrograph (SEM). Its surface is covered in characteristic microvilli. Magnification: x6000 when printed at 10 centimetres wide.

Fossil debris in chalk. Coloured scanning electron micrograph (SEM) of a fossilised fragment of a coccolithotrope skeleton. Magnification: x8000 when printed at 10 centimetres wide.

E. coli bacteria. Coloured scanning electron micrograph (SEM) of Escherichia coli bacteria (white) on a gecko's tongue. Magnification: x8000 when printed at 10 centimetres wide.

E. coli bacteria. Coloured scanning electron micrograph (SEM) of Escherichia coli bacteria (pink) on a gecko's tongue. Magnification: x8000 when printed at 10 centimetres wide.

Blood cells. Coloured scanning electron micrograph (SEM) of red blood cells and an aggregate of platelets (yellow). Magnification: x4000 when printed at 10 centimetres wide.

Blood cells. Coloured scanning electron micrograph (SEM) of red blood cells (pink) and an aggregate of platelets (red). Magnification: x4000 when printed at 10 centimetres wide.

Rod-shaped bacterium. Coloured scanning electron micrograph (SEM) of a rod-shaped (bacillus) filamentous bacterium from a human mouth. Magnification: x1350 when printed at 10 centimetres wide.

Diatom, coloured scanning electron micrograph (SEM). The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species. Magnification: x3250 when printed at 10 centimetres wide.

Hoverfly head, coloured scanning electron micrograph (SEM). Magnification: x30 when printed at 10 centimetres wide.