Question: Who knows what the author of De Revolutionibus Orbium Coelestium discovered?
Answer(s):
answer: Heliocentrism
answer: Copernican heliocentrism
answer: Copernican Revolution

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:book.author.book_editions_published ns:m.04v1r71 . 
?c ns:base.argumentmaps.innovator.original_ideas ?x .
}