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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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The familiar sounds of your heart are made by the heart's valves as they open and close.

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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

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Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

Herbivores must overcome the wide variety of physical and chemical defences evolved by plants. Herbivores must overcome the wide variety of physical and chemical defences evolved by plants.
The American Lion was one of the abundant Pleistocene megafauna, a wide variety of very large mammal The American Lion was one of the abundant Pleistocene megafauna, a wide variety of very large mammal
Several species of squirrels have melanistic phases. In large parts of United States and Canada, the Several species of squirrels have melanistic phases. In large parts of United States and Canada, the
Fibroid tumors, or leiomyomas. Fibroids develop from the uterus to form a variety of hard, round ben Fibroid tumors, or leiomyomas. Fibroids develop from the uterus to form a variety of hard, round ben
A variety of cuff sizes A variety of cuff sizes
Blueberry bees (Osmia ribifloris) are efficient pollinators of a variety of plants, including this b Blueberry bees (Osmia ribifloris) are efficient pollinators of a variety of plants, including this b
Video: Evolutionary tree of life Animation

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