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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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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).
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
The human oxygen-hemoglobin dissociation curve.
Two species of diatoms showing clearly distinct morphologies.
These species are all at risk of extinction. Species with slow life-h
Living systems such as the human body consist of closely interrelated elements
Human Viruses Associated with Cancers Virus
Life support system of a developing human