Question: Who discovered Neptune and was discovered by Joseph Louis Gay-Lussac?
Answer(s):
answer: Urbain Le Verrier

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0c31h)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0c31h ns:astronomy.astronomical_discovery.discoverer ?x .
?x ns:influence.influence_node.influenced_by ns:m.0dprz . 
}