A. Charles Darwin
Darwin suggested that a sneer retains elements of baring one's teeth so as to threaten predators.
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The most important areas of Greek achievement were math and science. They achieved all kinds of things in the areas of psychology, astronomy, geometry, biology, physics, and medicine.
The rebels of Panama wanted independence from Columbia.
The U.S. in 1846 was not justified in going to war with Mexico, they didn't have justification to respond with violence.