Examlex
Based on findings from a national study of over 21,000 couples,family life researcher David Olson advises that a happy marriage requires:
Benjamin Banneker
An African American almanac author, surveyor, naturalist, and farmer known for his work on early Washington D.C. city plans and for advocating civil rights in the 18th century.
Mathematics
The abstract science of number, quantity, and space, either as abstract concepts (pure mathematics), or as applied to other disciplines such as physics and engineering (applied mathematics).
Mechanics
The branch of physics concerned with the motion of objects and the forces that cause this motion; also refers to the skilled trade of working with machinery.
Yellow Fever Epidemic
A severe outbreak of Yellow Fever, a viral disease transmitted by mosquitoes, which killed thousands in multiple instances throughout history, particularly in densely populated areas.
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