Nobody knows how whale sharks have sex, but these world-first aerial photos provide some big clues.
A mesmerizing 6-minute time lapse shows a single cell dividing seemingly endlessly until what was once a yellow blob has become a wriggling, darting salamander tadpole.
Meiosis is a specialized form of cell division that produces reproductive cells, such as plant and fungal spores, sperm and egg cells.
Men's testes were once thought to be free of bacteria, but a small new study suggests that microbes may live naturally in this part of the male reproductive system.
Human sperm cells are well-studied, so scientists were completely surprised to find a previously unknown structure in the little swimmers.
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