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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 modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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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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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.

The black-legged tick transmits Lyme disease The black-legged tick transmits Lyme disease
Parkinson’s Disease Parkinson’s Disease
Positron emission tomography (PET) image showing the difference in the metabolic activity of the bra Positron emission tomography (PET) image showing the difference in the metabolic activity of the bra
Dermatitis herpetiformis is a blistering skin condition associated with celiac disease. Dermatitis herpetiformis is a blistering skin condition associated with celiac disease.
The nucleus is bounded by a double membrane called the nuclear envelope The nucleus is bounded by a double membrane called the nuclear envelope
Pleiotropy in sickle cell disease Pleiotropy in sickle cell disease
Video: Lower Limb Arteries Animation

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