Who was born in 1855

American astronomer who founded Lowell Observatory, popularized the idea of Martian canals, and initiated the search that led to the discovery of Pluto

Belgian Symbolist poet, writer, and playwright who was nominated for the Nobel Prize in Literature six times

German sociologist, economist, and philosopher best known for his influential concepts of Gemeinschaft and Gesellschaft and for co-founding the German Sociological Association