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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

Phenotypic and molecular markers mapped on human chromosome 1 Phenotypic and molecular markers mapped on human chromosome 1
Human Cardiovascular System Human Cardiovascular System
Parrot Human (Solution) Parrot Human (Solution)
Human Population Blasts Off Human Population Blasts Off
A single cell from an early-stage human embryo A single cell from an early-stage human embryo
Human urinary system. Human urinary system.
Video: Glucagon (glycogenolysis and gluconeogenesis)

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