Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
A hypothetical hybrid zone.
x-ray view of a fracture
Surface Offset on San Andreas Fault
Post Care of a Hip Fracture
Fracture and Repair of Bone - Comminuted
Remains of an abscission zone between a leaf petiole and twig of horse chestnut (Aesculus hippocasta