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Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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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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As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.

Animal extinctions and human population growth. Animal extinctions and human population growth.
human ear human ear
Human embryonic stem cells stained with Tra-1-60 (green) - a stem cell marker and nestin (red), a ne Human embryonic stem cells stained with Tra-1-60 (green) - a stem cell marker and nestin (red), a ne
The Human Genetic Code The Human Genetic Code
Functional categories of human genes Functional categories of human genes
The human metallothionein IIA gene promoter The human metallothionein IIA gene promoter
Video: Polymerase chain reaction PCR - Animation

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