THOMAS FREDBERG / SCIENCE PHOTO LIBRARY THOMAS FREDBERG / SCIENCE PHOTO LIBRARY
Sperm bank sample. Sperm sample seen through a microscope lens. This is done to check the number and quality of the sperm, especially their motility (movement). This sample is being examined at Cryos International Sperm Bank, Aarhus, Denmark. The world's largest sperm bank, it has stocks of over 170 litres of sperm (around 130,000 samples) that are used for fertility treatments, creating more than 2000 babies each year. Photographed in 2012.
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