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On average, the stomach produces 2 L of hydrochloric acid per day.

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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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Less than one of every three adults with high LDL cholesterol has the condition under control. Only 48.1% with the condition are being treated for it.

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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

Otitis media. This illustration shows an inflamed tympanic cavity, which is the most common source o Otitis media. This illustration shows an inflamed tympanic cavity, which is the most common source o
The Movius line separates regions of the world where Acheulean hand axes were made from regions wher The Movius line separates regions of the world where Acheulean hand axes were made from regions wher
Running time on 100-meter sprint for men and women master athletes increases with age. Source: Korho Running time on 100-meter sprint for men and women master athletes increases with age. Source: Korho
Example of an employee setup screen in a computerized payroll program. Example of an employee setup screen in a computerized payroll program.
Photosynthesis: How Glucose Is Made During photosynthesis, the leaves of green plants absorb Photosynthesis: How Glucose Is Made During photosynthesis, the leaves of green plants absorb
Genomes Using Modifications of the Universal Genetic Code Genomes Using Modifications of the Universal Genetic Code
Video: DNA Replication

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