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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

Dicksonia antarctica, a species of tree fern Dicksonia antarctica, a species of tree fern
Bonsai Tree Bonsai Tree
Birds on a tree Birds on a tree
Phylogenetic tree based on the distribution of 120 alleles in 42 populations from around the world, Phylogenetic tree based on the distribution of 120 alleles in 42 populations from around the world,
How to use a tree diagram to find the probability How to use a tree diagram to find the probability
Coconut tree kids drawing Coconut tree kids drawing
Video: Acid-base imbalances - respiratory acidosis and alkalosis

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