Question: What was invented by Nikola Tesla and OttÃ³ BlÃ¡thy?
Answer(s):
answer: Alternating current

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.05d1y)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.05d1y ns:law.inventor.inventions ?x .
?x ns:law.invention.inventor ns:m.01kc73 . 
}