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Attempted Whale Shark Mating Caught on Camera for the First Time in HistoryNobody knows how whale sharks have sex, but these world-first aerial photos provide some big clues.
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Anaconda Mom Gives Birth to Baby Clones, No Male Required -
What Are Stem Cells?Embryonic stem cells can morph into any cell in the human body.
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Yellow, Blob-Like Cell Transforms into Wriggling Salamander in Surreal Time-Lapse VideoA 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.
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Smoking Marijuana Linked to Better Sperm Counts in Surprising StudyThe findings contradict previous research, but they are far from conclusive.
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Here's How Researchers Made Mice with 2 DadsMice with two dads are harder to make than mice with two moms.
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What Is Meiosis?Meiosis is a specialized form of cell division that produces reproductive cells, such as plant and fungal spores, sperm and egg cells.
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Men's Testes Have a 'Microbiome.' Could It Affect Fertility?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.
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New Barrel-Shaped Structure Discovered Inside SpermHuman sperm cells are well-studied, so scientists were completely surprised to find a previously unknown structure in the little swimmers.
