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Lowell comparison table
Subject has name has domain has degree is a kind of is an instance of has greatest achievement has definition has greatest blunder
19th century scientist   dead person  a scientist born between 1800 and 1900 AD 
astronomer astronomy scientist  a scientist specializing in astronomy 
LowellPercival Lowellastronomy1876 Harvard (distinction in mathematics) 19th century scientistLowell Observatory (financed with his own money) believes he observed a network of linear canals on the planet Mars built by extraterrestrial beings

Next 19th century scientistLundmark    Up19th century scientist, astronomer    Previous 19th century scientistLeavitt